How can I find the minimum number of open rectangles in a grid?

Given an N by N Boggle Grid, what is the equation to find how many possible words or how many paths there are on the Grid to check to see if it's a word? Example: 2x2 grid = 64, 3x3 grid=10305, 4x4 grid = 12029640, NxN grid =?

  • I have created a Java program to find all possible words already so I put a counter inside the code to get the total number of possible paths to look at to see if it's a word. Rather than using a computer to do the counting for me, how can I find the equation out for a NxN size grid?

  • Answer:

    As of 2014, this is an open problem in combinatorics that is unsolved for grids 5x5 or greater. UPDATE: As of February 12, 2014, Jelani Nelson, a professor at Harvard University, has computed the 5x5 grid to have 115066382913 paths.

Jaimal Ichharam at Quora Visit the source

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