Triangle of B-analogs of Stirling numbers of 2nd kind.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =9a(8) =13a(9) =1a(10) =1a(11) =16a(12) =58a(13) =40a(14) =1a(15) =1a(16) =25a(17) =170a(18) =330a(19) =121a(20) =1a(21) =1a(22) =36a(23) =395a(24) =1520a(25) =1771a(26) =364a(27) =1a(28) =1a(29) =49