a(n) = Sum_{k=0..n} (-1)^(n-k) * (3*k+1)^(k-1) * Stirling2(n,k).

A349528

a(n) = Sum_{k=0..n} (-1)^(n-k) * (3*k+1)^(k-1) * Stirling2(n,k).

Terms

    a(0) =1a(1) =1a(2) =6a(3) =80a(4) =1645a(5) =45962a(6) =1627080a(7) =69817575a(8) =3522349232a(9) =204343964292

External references