Expansion of e.g.f. exp(4*(exp(x) - 1 - x)).

Terms

a(0) =1a(1) =0a(2) =4a(3) =4a(4) =52a(5) =164a(6) =1364a(7) =7620a(8) =60148a(9) =449252a(10) =3831700a(11) =33811716a(12) =320082228a(13) =3178774564a(14) =33234163668a(15) =363535920196