Riordan array ((1-x^2c(x)^2)/(1-xc(x)-x^2c(x)^2),xc(x)), c(x) the g.f. of A000108.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =6a(7) =5a(8) =3a(9) =1a(10) =19a(11) =15a(12) =9a(13) =4a(14) =1a(15) =63a(16) =48a(17) =29a(18) =14a(19) =5a(20) =1a(21) =215a(22) =160a(23) =97a(24) =49a(25) =20a(26) =6a(27) =1a(28) =749a(29) =548