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) =2a(4) =4a(5) =12a(6) =37a(7) =105a(8) =268a(9) =625a(10) =1355a(11) =2772a(12) =5414a(13) =10188a(14) =18605a(15) =33161a(16) =57954a(17) =99683a(18) =169265a(19) =284452a(20) =474066a(21) =784852a(22) =1292567a(23) =2119923a(24) =3465620a(25) =5651323a(26) =9197673a(27) =14947276a(28) =24263704a(29) =39353486