Expansion of e.g.f. exp( (1 - (1+x)^4)/4 ).

Terms

a(0) =1a(1) =-1a(2) =-2a(3) =2a(4) =28a(5) =44a(6) =-464a(7) =-3088a(8) =1408a(9) =135872a(10) =726976a(11) =-2959936a(12) =-67261952a(13) =-293413888a(14) =3054389248a(15) =52458520064a(16) =178569842176