2656080domain: NAppears in sequences3rd differences of factorial numbers.at n=7A001565Number of permutations p of [n] with p(i) <> i^2.at n=10A187847Number of acyclic orientations of the Turán graph T(n,7).at n=10A267387Eighth column of Euler's difference table in A068106.at n=9A284204