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accepted How to determine the group structure of $E(\mathbb{R})$ for an elliptic curve $E/\mathbb{R}$
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comment How many numbers are less than million such that their digits sum is $\le 19$?
@jj172 I think that this does answer one of the two questions that were asked. Actually to me it is a better answer than just "the coefficient of $x^{19}$ in the following expression". Don't feel discouraged because someone downvoted your answer, there are other people like me, who value computational answers like this one just as much as a more theoretical one.