66280domain: NAppears in sequencesNumber of permutations of length n which avoid the patterns 1234, 3142, 3421.at n=15A116767Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant >=n.at n=19A210366Number of n X 2 0..1 arrays with each 1 adjacent to 1 or 2 king-move neighboring 1s.at n=9A295841