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) =3a(3) =7a(4) =16a(5) =31a(6) =57a(7) =100a(8) =171a(9) =287a(10) =476a(11) =783a(12) =1281a(13) =2088a(14) =3395a(15) =5511a(16) =8936a(17) =14479a(18) =23449a(19) =37964a(20) =61451a(21) =99455a(22) =160948a(23) =260447a(24) =421441a(25) =681936a(26) =1103427a(27) =1785415a(28) =2888896a(29) =4674367