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) =4a(3) =9a(4) =20a(5) =38a(6) =69a(7) =120a(8) =204a(9) =341a(10) =564a(11) =926a(12) =1513a(13) =2464a(14) =4004a(15) =6497a(16) =10532a(17) =17062a(18) =27629a(19) =44728a(20) =72396a(21) =117165a(22) =189604a(23) =306814a(24) =496465a(25) =803328a(26) =1299844a(27) =2103225a(28) =3403124a(29) =5506406