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Search: id:A123771
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| A123771 |
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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x3 which is symmetric after a rotation by 180 degrees. |
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1
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| 1, 2, 12, 45, 264, 1128, 6991, 32202, 202856, 973242, 6204349
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