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

Terms

a(0) =1a(1) =0a(2) =4a(3) =12a(4) =112a(5) =960a(6) =10848a(7) =141120a(8) =2122496a(9) =36094464a(10) =685578240a(11) =14385761280a(12) =330532435968