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

Terms

a(0) =1a(1) =1a(2) =5a(3) =11a(4) =23a(5) =43a(6) =77a(7) =133a(8) =225a(9) =375a(10) =619a(11) =1015a(12) =1657a(13) =2697a(14) =4381a(15) =7107a(16) =11519a(17) =18659a(18) =30213a(19) =48909a(20) =79161a(21) =128111a(22) =207315a(23) =335471a(24) =542833a(25) =878353a(26) =1421237a(27) =2299643a(28) =3720935a(29) =6020635