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

Terms

a(0) =1a(1) =2a(2) =5a(3) =20a(4) =90a(5) =440a(6) =2266a(7) =12110a(8) =66525a(9) =373320a(10) =2130865a(11) =12332512a(12) =72202860a(13) =426861830a(14) =2544727475a(15) =15280236800a(16) =92333523153a(17) =561054410200