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A266735
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Number of words on {1,1,2,2,3,3,...,n,n} avoiding the pattern 12345.
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9
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1, 1, 6, 90, 2520, 102011, 5176504, 307027744, 20472135280, 1496594831506, 117857270562568, 9869468603141427, 870255083860881152, 80185525536941657225, 7673807618627318341436, 759049283017632212000140, 77292554293281131959377376, 8075621155990277422800518076
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listen;
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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
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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