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

Terms

a(0) =0a(1) =1a(2) =1a(3) =5a(4) =14a(5) =34a(6) =72a(7) =141a(8) =261a(9) =465a(10) =806a(11) =1370a(12) =2296a(13) =3809a(14) =6273a(15) =10277a(16) =16774a(17) =27306a(18) =44368a(19) =71997a(20) =116725a(21) =189121a(22) =306286a(23) =495890a(24) =802704a(25) =1299169a(26) =2102497a(27) =3402341a(28) =5505566a(29) =8908690