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) =3a(4) =8a(5) =20a(6) =44a(7) =89a(8) =169a(9) =307a(10) =540a(11) =928a(12) =1568a(13) =2617a(14) =4329a(15) =7115a(16) =11640a(17) =18980a(18) =30876a(19) =50145a(20) =81345a(21) =131851a(22) =213596a(23) =345888a(24) =559968a(25) =906385a(26) =1466929a(27) =2373939a(28) =3841544a(29) =6216212