Generalized Stirling numbers of second kind.

Terms

a(0) =1a(1) =6a(2) =32a(3) =175a(4) =1012a(5) =6230a(6) =40819a(7) =283944a(8) =2090424a(9) =16235417a(10) =132609666a(11) =1135846062a(12) =10175352709a(13) =95108406130a(14) =925496853980