Triangle read by rows: Column k has e.g.f. t^k / ((1 - t)^(k + 1) * exp(t)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =9a(8) =12a(9) =6a(10) =9a(11) =44a(12) =84a(13) =72a(14) =24a(15) =44a(16) =265a(17) =640a(18) =780a(19) =480a(20) =120a(21) =265a(22) =1854a(23) =5430a(24) =8520a(25) =7560a(26) =3600a(27) =720a(28) =1854a(29) =14833