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A125331
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Number of base 21 circular n-digit numbers with adjacent digits differing by 3 or less.
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0
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1, 21, 135, 693, 4159, 25291, 157635, 995659, 6357119, 40921479, 265145505, 1727138841, 11300204035, 74208972755, 488874737353, 3229363648333, 21382430152111, 141869013922279, 942972599847861, 6277675948529895
(list;
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refs;
listen;
history;
text;
internal format)
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