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

Terms

a(0) =1a(1) =1a(2) =0a(3) =-4a(4) =2a(5) =52a(6) =-96a(7) =-975a(8) =4240a(9) =18460a(10) =-183448a(11) =-101716a(12) =7373216a(13) =-23650520a(14) =-230147920a(15) =2198499720a(16) =664806792a(17) =-124144328784a(18) =703989911368