a(n) = (1/4) * Sum_{k>=0} (3/4)^k * |Stirling1(n+k,k)|.

A390900

a(n) = (1/4) * Sum_{k>=0} (3/4)^k * |Stirling1(n+k,k)|.

Terms

    a(0) =1a(1) =12a(2) =528a(3) =38592a(4) =3946752a(5) =518851584a(6) =83360157696

External references