G.f. satisfies: A(x) = 1 + x/A(-x*A(x)^5)^2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =9a(4) =40a(5) =242a(6) =1528a(7) =10664a(8) =76956a(9) =575245a(10) =4395910a(11) =34131621a(12) =268146598a(13) =2122399923a(14) =16884293154a(15) =134689290877