Riordan array (f(x), x*g(x)), f(x) is the g.f. of A126952, g(x) is the g.f. of A117641.

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =1a(5) =1a(6) =21a(7) =6a(8) =1a(9) =1a(10) =93a(11) =25a(12) =7a(13) =1a(14) =1a(15) =421a(16) =112a(17) =29a(18) =8a(19) =1a(20) =1a(21) =1937a(22) =510a(23) =132a(24) =33a(25) =9a(26) =1a(27) =1a(28) =9017a(29) =2357