383578domain: NAppears in sequencesA hexagonal spiral Fibonacci sequence.at n=28A094926Number of kites on an n X n grid (or geoboard).at n=18A189417Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 3,0,1,1,0,0,0 for x=0,1,2,3,4,5,6.at n=6A197942