a(n) = Sum_{k=0..n} binomial(n+k-1,k) * Stirling1(n,k) * k!.

A382840

a(n) = Sum_{k=0..n} binomial(n+k-1,k) * Stirling1(n,k) * k!.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =30a(4) =316a(5) =4290a(6) =71268a(7) =1400112a(8) =31750416a(9) =816215760a(10) =23455342560a(11) =745073660496

External references