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

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =8a(5) =25a(6) =68a(7) =163a(8) =357a(9) =730a(10) =1417a(11) =2642a(12) =4774a(13) =8417a(14) =14556a(15) =24793a(16) =41729a(17) =69582a(18) =115187a(19) =189614a(20) =310786a(21) =507715a(22) =827356a(23) =1345697a(24) =2185703a(25) =3546350a(26) =5749603a(27) =9316428a(28) =15089782a(29) =24433615