a(n) = Sum_{j=0..10} (-n)^j.

Terms

a(0) =1a(1) =1a(2) =683a(3) =44287a(4) =838861a(5) =8138021a(6) =51828151a(7) =247165843a(8) =954437177a(9) =3138105961a(10) =9090909091a(11) =23775972551a(12) =57154490053a(13) =128011456717a(14) =269971011311a(15) =540609741211