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A123834
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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 3 X 3 which is symmetric after a rotation by 90 degrees.
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0
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1, 1, 1, 1, 7, 10, 13, 50, 190, 292, 403, 1873, 6982
(list; graph; refs; listen; history; internal format)
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