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A123789
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Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x5 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, 5, 7, 49, 77, 572, 949, 7245, 12361, 96063
(list; graph; refs; listen; history; internal format)
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