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

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =28a(5) =245a(6) =1446a(7) =6727a(8) =26888a(9) =459657a(10) =11208970a(11) =180639371a(12) =2158548492a(13) =21024981133a(14) =176560640270