a(n) = [x^n] Product_{k=1..n} 1/(1 - k^2*x)^n.

A384092

a(n) = [x^n] Product_{k=1..n} 1/(1 - k^2*x)^n.

Terms

    a(0) =1a(1) =1a(2) =67a(3) =19316a(4) =14842986a(5) =23959995900

External references