a(0) = 1, a(n) = 1 - n * a(n-1).

Terms

a(0) =1a(1) =0a(2) =1a(3) =-2a(4) =9a(5) =-44a(6) =265a(7) =-1854a(8) =14833a(9) =-133496a(10) =1334961a(11) =-14684570a(12) =176214841a(13) =-2290792932a(14) =32071101049a(15) =-481066515734