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EXAMPLE
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For n=1, we have a single square hole, so a(1)=7.
For n=2, we have a domino hole, so a(2)=9.
For n=3, we can use either an L or V tromino hole, so a(3)=11.
For n=4, we use the square tetromino hole, so a(4)=11.
For n=5, we use the P pentomino hole, so a(5)=13.
For n=6, we use the 2 X 3 rectangle hole, so a(6)=13.
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