Expansion of A(x) = 1 + x + x*A(x) + x^2*A(x)^2 + x^3*A(x)^3.

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =24a(5) =73a(6) =230a(7) =751a(8) =2512a(9) =8549a(10) =29520a(11) =103192a(12) =364441a(13) =1298336a(14) =4660273a(15) =16837743a(16) =61187249a(17) =223489715a(18) =820040293a(19) =3021286338a(20) =11172619317a(21) =41454901924a(22) =154285693649a(23) =575826677260