G.f. satisfies: A(x) = Sum_{n>=0} x^n * A(x)^(n^2) * A(-x)^(n^2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =17a(6) =51a(7) =199a(8) =653a(9) =2746a(10) =9506a(11) =41887a(12) =150209a(13) =683534a(14) =2513812a(15) =11714529a(16) =43913589a(17) =208460660a(18) =793362271a(19) =3822998161a(20) =14731492719a(21) =71883765642a(22) =279923388563