-2684domain: ZAppears in sequencesa(n) = -n^2 - n + 72.at n=52A110678Triangle read by rows: T(n,k) (0 <= k <= n) gives numerators of coefficients in Nörlund's polynomials D_{2n}(x).at n=18A260327Expansion of g.f.: 1/(Sum_{p odd prime} x^p)^2 (even powers only).at n=21A351317