ISL 1979 Problem 32

Let $n, k \ge 1$ be natural numbers. Find the number $A(n, k)$ of solutions in integers of the equation $|x_1| + |x_2| +\cdots + |x_k| = n$

Dataset text AI-MO AoPS. Quoted with source.

Solutions

No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.