a(n) = n*B(n), where B(n) are the Bell numbers, A000110.

A070071

a(n) = n*B(n), where B(n) are the Bell numbers, A000110.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =15a(4) =60a(5) =260a(6) =1218a(7) =6139a(8) =33120a(9) =190323a(10) =1159750a(11) =7464270a(12) =50563164a(13) =359377681a(14) =2672590508a(15) =20744378175a(16) =167682274352

External references