# Is there a formula to quickly express delayed functions in terms of finite differences?

It is easy to express difference deltas in terms of delayed functions as follows:

$$\Delta^n [f](x)= \sum_{k=0}^n {n \choose k} (-1)^{n-k} f(x+k)$$

For example.

But what about the inverse process, is there a formula?

-
There is: for every integer $n\geqslant0$, $$f(x+n)=\sum_{k=0}^n\Delta^k[f](x).$$