G.f. A(x) satisfies: 0 = Sum_{n=-oo..+oo} x^(n^2) * (x^n - A(x))^(n+1).

Terms

a(0) =1a(1) =2a(2) =2a(3) =5a(4) =13a(5) =34a(6) =100a(7) =310a(8) =973a(9) =3124a(10) =10251a(11) =34086a(12) =114610a(13) =389205a(14) =1332788a(15) =4596587a(16) =15952281a(17) =55667566a(18) =195209636a(19) =687535017a(20) =2431044066a(21) =8626448629a(22) =30709429207a(23) =109645265403a(24) =392536229012