Expansion of Sum_{k>=0} (k^2 * x/(1 - x))^k.

A355495

Expansion of Sum_{k>=0} (k^2 * x/(1 - x))^k.

Terms

    a(0) =1a(1) =1a(2) =17a(3) =762a(4) =67772a(5) =10032208a(6) =2226273192a(7) =691431572992

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