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Search: id:A117106
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| A117106 |
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Number of permutations in S_n avoiding 21{bar 3}54 (i.e. every occurrence of 2154 is contained in an occurrence of a 21354). |
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1
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| 1, 2, 6, 23, 104, 530, 2958, 17734, 112657, 750726, 5207910, 37387881, 276467208
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