Triangle of generalized Stirling numbers of 2nd kind.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =6a(5) =5a(6) =1a(7) =12a(8) =32a(9) =15a(10) =1a(11) =20a(12) =110a(13) =175a(14) =52a(15) =1a(16) =30a(17) =280a(18) =945a(19) =1012a(20) =203a(21) =1a(22) =42a(23) =595a(24) =3465a(25) =8092a(26) =6230a(27) =877a(28) =1a(29) =56