Expansion of g/(1 - x^4*g^3), where g = 1+x*g^2 is the g.f. of A000108.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =46a(6) =146a(7) =477a(8) =1596a(9) =5441a(10) =18833a(11) =66012a(12) =233844a(13) =835898a(14) =3011377a(15) =10922595a(16) =39854562a(17) =146192568a(18) =538789354a(19) =1994108253a(20) =7408576716a(21) =27619927605a(22) =103294688949a(23) =387421997450