48777domain: NAppears in sequencesa(n) = A027052(n, 2n-8).at n=10A027064Partial sums of A038580.at n=28A086749a(n) = 58*n^2 - 1.at n=28A158668Dirichlet g.f.: zeta(s-3)^2 * (1 - 2^(4-s)) / zeta(s).at n=28A369101a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} gcd(x_1, x_2, x_3, n)^3.at n=28A372928