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A154658
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Number of permutations of length n within distance 9.
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6
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1, 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 33022080, 277280640, 2184341040, 16427628720, 119892387720, 861175365144, 6157828055310, 44222780245622, 321113303226243, 2369364111428885, 17667206334000068, 132553643382927196, 997400200347756816
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OFFSET
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0,3
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COMMENTS
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a(n) equals the permanent of the n X n matrix with 1's along the central nineteen diagonals, and 0's everywhere else. - John M. Campbell, Jul 10 2011
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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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