Expansion of e.g.f. exp( x * (exp(x^2) - 1) ).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =0a(5) =60a(6) =360a(7) =840a(8) =20160a(9) =75600a(10) =1058400a(11) =10311840a(12) =79833600a(13) =1305944640a(14) =11018367360a(15) =174616041600