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A115508
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Number of permutations where for every pair of adjacent elements one element in binary notation has ones at the same or adjacent positions to those of the other element.
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2
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1, 2, 6, 4, 4, 40, 120, 72, 140, 824, 3312, 22320, 110976, 1369536, 9477120, 3596160, 3235584, 36927360, 286846848, 700001376
(list; graph; refs; listen; history; internal format)
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