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

Terms

a(0) =1a(1) =0a(2) =2a(3) =6a(4) =26a(5) =150a(6) =962a(7) =6846a(8) =54266a(9) =471750a(10) =4439762a(11) =44911086a(12) =485570186a(13) =5581383990a(14) =67890295202a(15) =870493380126