a(n) = Sum_{k=1..n} C(n-1,k-1) * S2(n,k) for n>0, a(0)=1, where S2(n,k) = A048993(n,k) are Stirling numbers of the 2nd kind.

A134055

a(n) = Sum_{k=1..n} C(n-1,k-1) * S2(n,k) for n>0, a(0)=1, where S2(n,k) = A048993(n,k) are Stirling numbers of the 2nd kind.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =8a(4) =41a(5) =252a(6) =1782a(7) =14121a(8) =123244a(9) =1169832a(10) =11960978a(11) =130742196a(12) =1518514076a(13) =18645970943a(14) =241030821566

External references