a(n) = 1 - n^11.

Terms

a(0) =1a(1) =0a(2) =-2047a(3) =-177146a(4) =-4194303a(5) =-48828124a(6) =-362797055a(7) =-1977326742a(8) =-8589934591a(9) =-31381059608a(10) =-99999999999a(11) =-285311670610a(12) =-743008370687