G.f. A(x) satisfies A(x) = 1 + x^3*(1+x)*A(x)^2.

Terms

a(0) =1a(1) =0a(2) =0a(3) =1a(4) =1a(5) =0a(6) =2a(7) =4a(8) =2a(9) =5a(10) =15a(11) =15a(12) =19a(13) =56a(14) =84a(15) =98a(16) =224a(17) =420a(18) =552a(19) =1002a(20) =2022a(21) =3069a(22) =4983a(23) =9801a(24) =16577a(25) =26455a(26) =49049a(27) =87945a(28) =144287a(29) =255112