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A211284
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a(n) = number of n-lettered words in the alphabet {1, 2, 3} with as many occurrences of the substring (consecutive subword) [1, 1, 1] as of [1, 2, 2].
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0
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1, 3, 9, 25, 70, 197, 554, 1563, 4416, 12502, 35463, 100783, 286965, 818614, 2339534, 6698297, 19211785, 55197778, 158857016, 457932482, 1322162806, 3823263357, 11071998176, 32109724225, 93248516464, 271155229971, 789479244108, 2301369264646, 6716318395056, 19622420290276, 57388871934035
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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