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Oct
20
answered Question on data compression
Oct
15
answered Number of unlabeled simple graphs with $n$ nodes even for all $ n\ge 5$?
Oct
15
comment Number of unlabeled simple graphs with $n$ nodes even for all $ n\ge 5$?
Ah, it doesn't have simple in the title so my search didn't find it. Thanks for adding the link.
Oct
15
comment Number of unlabeled simple graphs with $n$ nodes even for all $ n\ge 5$?
Are you referring to A005470 (in which case you seem to be missing the very important word planar from the question) or to a different sequence?
Oct
12
reviewed Approve Limit of a sum is the sum of the limits: proof by induction
Oct
12
reviewed Close Can anyone help me prove block diagonal matrix?
Oct
12
reviewed Close Simple Question on Quantifier Logic
Oct
12
reviewed Close Growth of $\sum_{x=1}^{n-1} \left\lceil n-\sqrt{n^{2}-x^{2} } \right\rceil$
Oct
12
revised Counting all possible board positions in Quoridor
added 1987 characters in body
Oct
12
comment Counting all possible board positions in Quoridor
@lameK, I got 55 by writing a short computer program, but as I used an obscure language to do it I didn't see any benefit to sharing it. I'll add some examples to the last paragraph.
Oct
10
revised Counting all possible board positions in Quoridor
added 152 characters in body
Oct
10
answered Counting all possible board positions in Quoridor
Oct
6
reviewed Close Integrating by splitting up trig functions
Oct
6
reviewed Close Integer multiplication in 5T(n/3)
Oct
6
comment Can anyone extend my findings for Langford Pairings?
I don't actually see a question. If this is an attempt to follow David Eppstein's advice that for your ideas to be included in the Wikipedia page on Langford pairing you should first get them published, then you should be aware that he was talking about publication in a peer-reviewed journal, not on a Q&A site.
Oct
6
answered How to prove 2 is a primitive root mod 37, without calculating all powers of 2 mod 37?
Sep
30
awarded  Explainer
Sep
22
comment No simple closed form for Bell numbers
The premise of your question is somewhat unclear, because "closed form" is a somewhat variable quantity. Unless you allow factorials in a closed form, I can't think of any basic combinatorial quantity which has one. Allowing them lets in binomial coefficients and therefore Catalan numbers, but what else? Such basic combinatorial quantities as Stirling numbers and the partition function don't have well-known closed forms.
Sep
15
reviewed Close What are the root of $x^3 - 2$ $\in \mathbb{R}[x]$?
Sep
13
reviewed Reopen condition for transitivity