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A124696
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Number of base 3 circular n-digit numbers with adjacent digits differing by 1 or less.
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0
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1, 3, 7, 15, 35, 83, 199, 479, 1155, 2787, 6727, 16239, 39203, 94643, 228487, 551615, 1331715, 3215043, 7761799, 18738639, 45239075, 109216787, 263672647, 636562079, 1536796803, 3710155683, 8957108167, 21624372015, 52205852195
(list; graph; refs; listen; history; internal format)
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