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

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =54a(5) =265a(6) =1373a(7) =7388a(8) =40888a(9) =231250a(10) =1330618a(11) =7764670a(12) =45841323a(13) =273316120a(14) =1643345418a(15) =9953021248a(16) =60665811025a(17) =371850104167