a(n) = floor((1/n)*(S(n,1) + S(n,2) + ... + S(n,n))), where S(i,j) are Stirling numbers of second kind.

A024426

a(n) = floor((1/n)*(S(n,1) + S(n,2) + ... + S(n,n))), where S(i,j) are Stirling numbers of second kind.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =10a(5) =33a(6) =125a(7) =517a(8) =2349a(9) =11597a(10) =61688a(11) =351133a(12) =2126495a(13) =13635665a(14) =92197236a(15) =655008884a(16) =4874404106a(17) =37893155897a(18) =306986431845

External references