Constant term of the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.

Terms

a(0) =1a(1) =1a(2) =17a(3) =83a(4) =275a(5) =727a(6) =1673a(7) =3505a(8) =6873a(9) =12843a(10) =23155a(11) =40639a(12) =69889a(13) =118353a(14) =198097a(15) =328659a(16) =541667a(17) =888311a(18) =1451433a(19) =2365089a(20) =3846201a(21) =6245771a(22) =10131747a(23) =16423103a(24) =26606785a(25) =43088737a(26) =69761873a(27) =112925075a(28) =182770163a(29) =295787863