G.f. satisfies A(x) = 1 + x*A(x) / (1 - x^4*A(x)^5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =8a(7) =29a(8) =85a(9) =212a(10) =481a(11) =1081a(12) =2627a(13) =7100a(14) =20328a(15) =58023a(16) =160430a(17) =430391a(18) =1140892a(19) =3051678a(20) =8334638a(21) =23199896a(22) =65148939a(23) =182781853a(24) =510225082a(25) =1419091293a(26) =3948954920a(27) =11034704856a(28) =31001204632a(29) =87466532564