G.f. A(x) satisfies: A(x) = 1 - x^2 * A(x/(1 - x)) / (1 - x).

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =0a(5) =3a(6) =9a(7) =16a(8) =7a(9) =-87a(10) =-472a(11) =-1567a(12) =-3375a(13) =-216a(14) =45927a(15) =308107a(16) =1372744a(17) =4351599a(18) =5711849a(19) =-49345432a(20) =-547773585a(21) =-3517370859a(22) =-16914970464a(23) =-56474505155a(24) =-25470754271