This is my question:
Given $n$ and $k$, find the coefficient of $x^n$ in $(1+x+x^2+x^3+\cdots)^k$
The largest term needed in each block is $n-k+1$, and that's all I have figured out. I'm guessing the answer includes $n-k+1$ choose something.
I don't even know if I can solve this, but any help would be appreciated!