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A338729
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a(n) = number of permutations avoiding the simsum pattern 213 and the classical pattern 321.
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0
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OFFSET
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0,3
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LINKS
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Marilena Barnabei, Flavio Bonetti, Niccolò Castronuovo, Matteo Silimbani, Permutations avoiding a simsun pattern, The Electronic Journal of Combinatorics (2020) Vol. 27, Issue 3, P3.45. See Section 4.3.
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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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STATUS
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approved
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