120567domain: NAppears in sequencesNumber of permutations of length n which avoid the patterns 1243, 2341, 4321.at n=23A116825Number of n X 3 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.at n=15A229423