120780domain: NAppears in sequencesa(n) = A000203(n) * A024916(n).at n=39A143238Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x) defined below in Comments.at n=10A192380a(n) = largest k such that A049820(k) <= A262509(n).at n=16A263083