G.f. satisfies A(x) = 1 + x*A(x)*(1 + x^4*A(x)^3).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =6a(7) =16a(8) =36a(9) =71a(10) =131a(11) =247a(12) =511a(13) =1156a(14) =2696a(15) =6172a(16) =13664a(17) =29563a(18) =63871a(19) =140341a(20) =315185a(21) =717962a(22) =1639822a(23) =3728276a(24) =8432696a(25) =19047924a(26) =43166420a(27) =98378502a(28) =225355290a(29) =517683270