17178876domain: NAppears in sequencesa(n) = A001512(n)/24 = (5*n+1)*(5*n+2)*(5*n+3)*(5*n+4)/24.at n=28A151989Number of ways to choose four points in an n X n grid (or geoplane).at n=11A189345Number of 5-member subsets of [5*n] whose elements sum to a multiple of n.at n=29A318626