How many distinct lines are there for a rectangular grid of $m \times n$ dots?
2217
Total number of lines in a 2D grid
145427
Determine if a set of tiles on a grid forms an enclosed shape
109740
Bresenham's line algorithm
37079
How to automatically generate N "distinct" colors?
377
Problem involving many squares and several variables.
130851
Squaring the plane, with consecutive integer squares. And a related arrangement
120744
How many $n\times m$ binary matrices are there, up to row and column permutations?
62175
A general formula for $n$ distinguishable arrangements of length $\ell$ of a sequence of a given size?
129997
Unique line in $\mathbb{P}^3$ through a point $p$ and intersecting two disjoint lines
138178
Proving the number of iterations in the Euclidean algorithm
62518
How many rectangles or triangles.
99593
Determine the number of ways to colour a 1 by n grid using the colours red and white if an even number of squares are to be coloured red.
123939
N circles in the plane
2628
Counting number of moves on a grid
141782
Grid of responsive squares
35864
Playing with numbers form $1$ to $n^2$ in an $n\times n$ grid
83250
How can I find the number of the shortest paths between two points on a 2D lattice grid?