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A124935
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Number of base 18 circular n-digit numbers with adjacent digits differing by 2 or less.
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0
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1, 18, 84, 312, 1352, 5908, 26490, 120278, 552032, 2553972, 11892734, 55672118, 261759734, 1235323302, 5848421012, 27764530552, 132124679472, 630077734772, 3010344270942, 14406602755262, 69048608938842, 331383832210022
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listen;
history;
text;
internal format)
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