E.g.f.: Sum_{n>=1} x^(n^2) * exp(n*x^n) / n!.

Terms

a(0) =1a(1) =2a(2) =3a(3) =16a(4) =5a(5) =726a(6) =7a(7) =40328a(8) =60489a(9) =2419210a(10) =11a(11) =399168012a(12) =13a(13) =11623772174a(14) =980755776015a(16) =17a(18) =19a(22) =23