4453488domain: NAppears in sequencesNumber of 3 X 3 symmetric matrices over Z(n) having nonzero determinant.at n=12A115225Order of the group of invertible 3 X 3 symmetric matrices over Z(n).at n=12A115226Number of solutions to gcd(u^2 + v^2 + w^2 + x^2 + y^2 + z^2, n) = 1 with u, v, w, x, y, z in [0,n-1].at n=12A238534