G.f. A(x) satisfies: A( x*A(x) - A(x)^2 ) = -x^3.

Terms

a(0) =1a(1) =1a(2) =-1a(3) =2a(4) =-4a(5) =12a(6) =-36a(7) =115a(8) =-366a(9) =1202a(10) =-4016a(11) =13684a(12) =-47192a(13) =164550a(14) =-578773a(15) =2051994a(16) =-7324990a(17) =26306860a(18) =-94980720a(19) =344555898a(20) =-1255235744a(21) =4590432218a(22) =-16845658552a(23) =62014596756a(24) =-228956736888a(25) =847546307549