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

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =0a(7) =0a(8) =3a(9) =7a(10) =4a(11) =0a(12) =12a(13) =45a(14) =55a(15) =22a(16) =55a(17) =286a(18) =546a(19) =455a(20) =413a(21) =1820a(22) =4760a(23) =6120a(24) =5304a(25) =12597a(26) =38760a(27) =67830a(28) =73587a(29) =108262