G.f. A(x) satisfies A(x) = 1 + x*A(x)^3 - x^2*A(x)^5.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =5a(5) =-13a(6) =-147a(7) =-816a(8) =-3534a(9) =-12650a(10) =-35420a(11) =-53040a(12) =199056a(13) =2391340a(14) =14555740a(15) =68264112a(16) =261045693a(17) =769660569a(18) =1167906402a(19) =-5145668100a(20) =-61758940705a(21) =-385813067255