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A238918
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Number of self-inverse permutations p on [n] where the maximal displacement of an element equals 7.
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2
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0, 0, 0, 0, 0, 0, 0, 0, 76, 438, 1846, 6664, 22322, 71223, 221747, 685899, 2133273, 6639848, 20631028, 63857132, 196698620, 602652416, 1837237916, 5577247428, 16876196404, 50936285192, 153419520771, 461274617487, 1384650408582, 4150200289940, 12421725164955
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OFFSET
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0,9
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LINKS
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EXAMPLE
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a(8) = 76: 82345671, 82345761, 82346571, 82347651, ..., 87543621, 87563421, 87645321, 87654321.
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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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