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

Terms

a(0) =1a(1) =1a(2) =0a(3) =-1a(4) =3a(5) =12a(6) =-7a(7) =-47a(8) =332a(9) =1347a(10) =-2105a(11) =-4200a(12) =135457a(13) =474697a(14) =-900832a(15) =4682135a(16) =126196787a(17) =439488524a(18) =233313817a(19) =19129265609a(20) =239146712732