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

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =16a(5) =92a(6) =616a(7) =4729a(8) =40776a(9) =388057a(10) =4028230a(11) =45207583a(12) =544680014a(13) =7004865885a(14) =95694153485