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A125328
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Number of base 18 circular n-digit numbers with adjacent digits differing by 3 or less.
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0
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1, 18, 114, 582, 3466, 20938, 129642, 813586, 5161418, 33012690, 212531034, 1375465890, 8940439306, 58322410658, 381620168176, 2503490173972, 16459423126778, 108417784128158, 715300322712000, 4725856346389840
(list; graph; refs; listen; history; internal format)
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