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

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =23a(5) =69a(6) =233a(7) =791a(8) =2807a(9) =10089a(10) =37043a(11) =137659a(12) =518009a(13) =1967409a(14) =7536249a(15) =29072599a(16) =112863479a(17) =440560817a(18) =1728178583a(19) =6808762011a(20) =26931287867a(21) =106903064137a(22) =425723073033