the right-down traveller
- Traveling is allowed only on the borders of the squares.
- You can travel only rightwards or downwards.
Note: M is the number of rows. N is the number of columns. an M X N grid contains M*N squares.
For example: a 2X2 grid, we have 6 ways to traverse as given in the illustration.
(Sorry for the shabby illustration. I am a really impatient guy :-P)