E.g.f.: Sum_{n>=0} x^(n^2)*exp(n^2*x).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =28a(5) =485a(6) =5766a(7) =53767a(8) =430088a(9) =3459465a(10) =53303050a(11) =1746391691a(12) =58977262092