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) =7a(3) =15a(4) =30a(5) =55a(6) =97a(7) =166a(8) =279a(9) =463a(10) =762a(11) =1247a(12) =2033a(13) =3306a(14) =5367a(15) =8703a(16) =14102a(17) =22839a(18) =36977a(19) =59854a(20) =96871a(21) =156767a(22) =253682a(23) =410495a(24) =664225a(25) =1074770a(26) =1739047a(27) =2813871a(28) =4552974a(29) =7366903