Generalized Stirling numbers.

Terms

a(0) =0a(1) =0a(2) =6a(3) =72a(4) =650a(5) =5400a(6) =43757a(7) =353192a(8) =2862330a(9) =23352300a(10) =191891117a(11) =1587587760a(12) =13215894133a(13) =110619113423a(14) =930376519256