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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =4a(6) =7a(7) =11a(8) =18a(9) =33a(10) =63a(11) =117a(12) =211a(13) =383a(14) =713a(15) =1348a(16) =2547a(17) =4793a(18) =9039a(19) =17165a(20) =32785a(21) =62761a(22) =120243a(23) =230768a(24) =444119a(25) =857015a(26) =1656931a(27) =3207990a(28) =6219994a(29) =12079544