117816domain: NAppears in sequencesNumber of permutations p of 1,2,...,n satisfying |p(i+4)-p(i)|<>5 and |p(j+5)-p(j)|<>4 for all i=1..n-4, j=1..n-5.at n=9A189570Number of ways to place n nonattacking composite pieces rook + rider[4,5] on an n X n chessboard.at n=8A189861