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

Terms

a(0) =1a(1) =3a(2) =10a(3) =23a(4) =47a(5) =88a(6) =157a(7) =271a(8) =458a(9) =763a(10) =1259a(11) =2064a(12) =3369a(13) =5483a(14) =8906a(15) =14447a(16) =23415a(17) =37928a(18) =61413a(19) =99415a(20) =160906a(21) =260403a(22) =421395a(23) =681888a(24) =1103377a(25) =1785363a(26) =2888842a(27) =4674311a(28) =7563263a(29) =12237688