Triangle read by rows, A007318 * (A007476 * 0 ^(n-k)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =3a(8) =3a(9) =2a(10) =1a(11) =4a(12) =6a(13) =8a(14) =4a(15) =1a(16) =5a(17) =10a(18) =20a(19) =20a(20) =9a(21) =1a(22) =6a(23) =15a(24) =40a(25) =60a(26) =54a(27) =23a(28) =1a(29) =7