G.f. satisfies A(x) = 1 + x*(1 + x*A(x)^6)^2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =13a(4) =66a(5) =406a(6) =2602a(7) =17271a(8) =118444a(9) =829514a(10) =5914980a(11) =42791085a(12) =313277294a(13) =2316793170a(14) =17281455882a(15) =129867946828a(16) =982293317064