G.f. satisfies: A(x) = (1 + x + x^2) * A(x^2)^4.

Terms

a(0) =1a(1) =1a(2) =5a(3) =4a(4) =30a(5) =26a(6) =106a(7) =80a(8) =459a(9) =379a(10) =1451a(11) =1072a(12) =5210a(13) =4138a(14) =14894a(15) =10756a(16) =47617a(17) =36861a(18) =127949a(19) =91088a(20) =376264a(21) =285176a(22) =957336a(23) =672160a(24) =2640964a(25) =1968804a(26) =6452260a(27) =4483456a(28) =16921416a(29) =12437960