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) =9a(3) =21a(4) =44a(5) =83a(6) =149a(7) =258a(8) =437a(9) =729a(10) =1204a(11) =1975a(12) =3225a(13) =5250a(14) =8529a(15) =13837a(16) =22428a(17) =36331a(18) =58829a(19) =95234a(20) =154141a(21) =249457a(22) =403684a(23) =653231a(24) =1057009a(25) =1710338a(26) =2767449a(27) =4477893a(28) =7245452a(29) =11723459