Starting in the top left corner of a 22 grid, there are 6 routes (without backtracking) to the bottom right corner.
How many routes are there through a 2020 grid?
計算量が少なくなりそうなのはどっちだろうね？
求める値は
2 grid, there are 6 routes (without backtracking) to the bottom right corner.
20 grid?
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