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

A351508

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

Terms

    a(0) =1a(1) =1a(2) =23a(3) =1386a(4) =162154a(5) =31354800a(6) =9078595483

External references