4031123domain: NAppears in sequencesNumber of points in Z^7 of norm <= n.at n=7A055413Number of points in Z^n of norm <= 7.at n=7A055431a(n) = [x^(n^2)] theta_3(x)^n/(1 - x), where theta_3() is the Jacobi theta function.at n=7A302861