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A123773
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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 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, 3, 4, 16, 24, 103, 163, 721, 1173, 5283, 8783, 39912, 67381, 308314
(list; graph; refs; listen; history; internal format)
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