What is the number of solutions of $(a_i)_{i=1}^n$ such that $$\sum_{i=1}^nia_i\le b,\quad a_i\in\{-1,1\},\quad \sum_{i=1}^n{a_i}=c$$ given $b,c\in\mathbf Z$?
Is there a generating function solution?
2026-03-28 06:09:18.1774678158
Sign Enumeration
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