60505200domain: NAppears in sequencesa(n) = n^5*(n+1)^2/2.at n=14A163275Dirichlet g.f.: Product_{k>=2} 1 / (1 - k^(-s))^(k^5).at n=27A343285Triangle read by rows: T(n, k) = n^k * Sum_{j=0..n} binomial(n - j, n - k) * Eulerian1(n, j).at n=32A372311