85394646domain: NAppears in sequencesNumber of multiset permutations of {1, 1, 2, 2, ..., n, n} with no fixed points.at n=7A000459Duplicate of A000459.at n=7A059072Square array read by antidiagonals: T(n,k) is the number of derangements of a multiset comprising n repeats of a k-element set.at n=47A372307