161452domain: NAppears in sequencesNumber of ways to place zero or more nonadjacent 1,0 1,1 2,0 3,0 4,1 4,2 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155285Number of strings of numbers x(i=1..7) in 0..n with sum i^4*x(i) equal to 2401*n.at n=25A184353