-3721domain: ZAppears in sequencesNumerator of Euler(n, 3/7).at n=5A156196Inverse Euler transform of the unsigned Moebius function A008966.at n=56A320782Dirichlet g.f.: 1 / zeta(s-2).at n=60A334657a(1) = 1, a(2) = -5; a(n) = -n^2 * Sum_{d|n, d < n} a(d) / d^2.at n=60A359485