1063756domain: NAppears in sequencesNumber of concave kites (darts or arrowheads) on an n X n grid (or geoboard).at n=20A173502Number of nX6 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,0) or (-1,-1) and new values introduced in order 0..2.at n=7A275502