76177domain: NAppears in sequencesStrong pseudoprimes to base 74.at n=27A020300Central coefficients of number triangle A113582.at n=23A154323Number of ways to place zero or more nonadjacent 0,0 1,0 2,1 3,1 4,0 4,1 5,0 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155344