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A217328
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Number of self-inverse permutations in S_n with longest increasing subsequence of length 8.
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2
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1, 8, 71, 461, 3057, 18225, 109446, 628652, 3628517, 20538209, 116808172, 659078098, 3737763884, 21153403644, 120354760098, 685455514294, 3925104616303, 22535893275064, 130089736567064, 753604985013128, 4388755545268226, 25660332309744370, 150802834643569274
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OFFSET
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8,2
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COMMENTS
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Also the number of Young tableaux with n cells and 8 rows.
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LINKS
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FORMULA
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EXAMPLE
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a(8) = 1: 12345678.
a(9) = 8: 123456798, 123456879, 123457689, 123465789, 123546789, 124356789, 132456789, 213456789.
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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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