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A239375
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Number of words of length n over the alphabet {0, ..., n-1} that avoid the pattern 1221.
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0
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1, 1, 4, 27, 250, 2915, 40766, 662494, 12236190, 252664815, 5759288044, 143463453199, 3873471153366, 112587628893480
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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