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

Terms

a(0) =1a(1) =1a(2) =4a(3) =25a(4) =185a(5) =1495a(6) =12776a(7) =113534a(8) =1038535a(9) =9713905a(10) =92480570a(11) =893215584a(12) =8730601596a(13) =86198356180a(14) =858388634250