a(n) = sum(abs(stirling1(n,k))*stirling2(n+1,k+1),k=0..n).

A192548

a(n) = sum(abs(stirling1(n,k))*stirling2(n+1,k+1),k=0..n).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =33a(4) =426a(5) =7670a(6) =181000a(7) =5376777a(8) =195238792a(9) =8472419484a(10) =431606519268

External references