253770domain: NAppears in sequencesLimiting values of A136406: a(n) = A136406(m,m-n) for any m >= 2n.at n=39A137504Number of inequivalent (mod D_3) ways to place 3 points on a triangular grid of side n so that they are not vertices of an equilateral triangle with sides parallel to the grid.at n=18A243208