Expansion of g.f. A(x) satisfying 1 = Sum_{n=-oo..+oo} x^n * (x^(3*n+1) - A(x))^n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =23a(6) =55a(7) =138a(8) =349a(9) =904a(10) =2377a(11) =6323a(12) =16993a(13) =46036a(14) =125625a(15) =344973a(16) =952565a(17) =2643257a(18) =7366942a(19) =20613366a(20) =57884187a(21) =163071852a(22) =460769168a(23) =1305466309a(24) =3707928596a(25) =10555941648a(26) =30115379589a(27) =86087330322a(28) =246541672062a(29) =707274898726