Triangle read by rows: a(n,k) = (k-1)! * C(n,k).

Terms

a(0) =1a(1) =2a(2) =1a(3) =3a(4) =3a(5) =2a(6) =4a(7) =6a(8) =8a(9) =6a(10) =5a(11) =10a(12) =20a(13) =30a(14) =24a(15) =6a(16) =15a(17) =40a(18) =90a(19) =144a(20) =120a(21) =7a(22) =21a(23) =70a(24) =210a(25) =504a(26) =840a(27) =720a(28) =8a(29) =28