G.f. satisfies: A(x) = Sum_{n>=0} x^(n^2)*A(x)^(n^4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =18a(6) =154a(7) =970a(8) =4862a(9) =20879a(10) =83672a(11) =353281a(12) =1773612a(13) =11060634a(14) =84779040a(15) =772415014a(16) =7726721969a(17) =77774342729a(18) =747754441850