a(n) = (n-1)^(n+1) - n^n.

Terms

a(0) =-2a(1) =-1a(2) =-3a(3) =-11a(4) =-13a(5) =971a(6) =31469a(7) =856073a(8) =23576391a(9) =686321335a(10) =21381059609a(11) =714688329389