43301domain: NAppears in sequencesNumber of ways to place zero or more nonadjacent 0,0 1,0 2,0 2,1 3,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155273Number of 8-element subsets of [n] having a prime element sum.at n=13A320683