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A123797
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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x6 which is flat, i.e. with all blocks in parallel position and symmetric after a rotation by 180 degrees.
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0
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1, 1, 7, 10, 88, 142, 1277, 2193, 19967, 35449, 325809
(list; graph; refs; listen; history; internal format)
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