sum(stirling1(n,k)*stirling1(n+1,k+1),k=0..n).

A192547

sum(stirling1(n,k)*stirling1(n+1,k+1),k=0..n).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =41a(4) =746a(5) =20952a(6) =837222a(7) =45064203a(8) =3140545942a(9) =274969698158

External references