G.f. satisfies: A(x) = x + A( A(x)^4 - A(x)^10 ).

Terms

a(0) =1a(1) =1a(2) =4a(3) =21a(4) =126a(5) =817a(6) =5574a(7) =39418a(8) =286286a(9) =2122491a(10) =15995696a(11) =122166551a(12) =943430560a(13) =7353998931a(14) =57783603764a(15) =457176705018