Riordan array (1, (A000045(x)/x-1) *A001006(A000045(x)/x-1) ).

Terms

a(0) =1a(1) =3a(2) =1a(3) =9a(4) =6a(5) =1a(6) =31a(7) =27a(8) =9a(9) =1a(10) =113a(11) =116a(12) =54a(13) =12a(14) =1a(15) =431a(16) =493a(17) =282a(18) =90a(19) =15a(20) =1a(21) =1697a(22) =2098a(23) =1383a(24) =556a(25) =135a(26) =18a(27) =1a(28) =6847a(29) =8975