95319domain: NAppears in sequencesNumber of ways to place 2 nonattacking kings on an n X n cylindrical chessboard.at n=20A194650Number of pairs of integer partitions (y, v) of n such that there exists a pair of set partitions of {1,...,n} with meet {{1},...,{n}}, the first having block sizes y and the second v.at n=19A318396