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

Terms

a(0) =1a(1) =2a(2) =2a(3) =7a(4) =16a(5) =44a(6) =113a(7) =298a(8) =778a(9) =2039a(10) =5336a(11) =13972a(12) =36577a(13) =95762a(14) =250706a(15) =656359a(16) =1718368a(17) =4498748a(18) =11777873a(19) =30834874a(20) =80726746a(21) =211345367a(22) =553309352a(23) =1448582692a(24) =3792438721a(25) =9928733474a(26) =25993761698a(27) =68052551623a(28) =178163893168a(29) =466439127884