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

Terms

a(0) =1a(1) =2a(2) =10a(3) =31a(4) =78a(5) =170a(6) =339a(7) =636a(8) =1144a(9) =1997a(10) =3412a(11) =5740a(12) =9549a(13) =15758a(14) =25854a(15) =42243a(16) =68818a(17) =111878a(18) =181615a(19) =294520a(20) =477276a(21) =773057a(22) =1251720a(23) =2026296a(24) =3279673a(25) =5307770a(26) =8589394a(27) =13899271a(28) =22490934a(29) =36392642