164692domain: NAppears in sequencesTriangle read by rows: T(m,n) (m >= n >= 1) = number of regions formed by drawing the line segments connecting any two of the (m+1) X (n+1) lattice points in an m X n grid of squares and extending them to the boundary of the grid.at n=27A333282Main diagonal of triangle in A333282.at n=6A333294