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A068596
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Number of 4-ary Lyndon words whose trace and subtrace are both 0 mod 4.
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12
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1, 0, 1, 1, 11, 44, 169, 588, 1948, 6560, 23133, 84565, 317755, 1198336, 4509419, 16909184, 63409935, 238609052, 902444517, 3429249843, 13076666409, 49977802752, 191312873561, 733365845820, 2815437297416, 10825960652800, 41694907460224, 160823207301705
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,5
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COMMENTS
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The trace of a word is the sum of its characters; the subtrace of a word is the sum of all products of pairs of its characters.
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LINKS
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CROSSREFS
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Cf. A074403, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074412, A074413.
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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