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Try making a table with the number of the square and the number of grains of rice on that square, this way it may be easier to spot a pattern. For example:
Square Number of grains of rice
1 1
3 4
4 ?
5 ?
6 ?
Try to link the number in the left column to its related number in the right column. Can you think of a general rule?
You may need to use powers.