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

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =-1a(6) =5a(7) =-6a(8) =16a(9) =-28a(10) =62a(11) =-125a(12) =267a(13) =-565a(14) =1213a(15) =-2618a(16) =5686a(17) =-12418a(18) =27248a(19) =-60048a(20) =132848a(21) =-294930a(22) =656878a(23) =-1467257a(24) =3286219a(25) =-7378239a(26) =16603459a(27) =-37441989a(28) =84599855a(29) =-191501531