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A102381
Number of permutations of 1..n in which every pair of adjacent numbers as well as the first and the last entries are relatively prime.
+0
4
1, 2, 6, 8, 60, 24, 504, 576, 6480, 5760, 242352, 93312, 6200064, 5612544, 95294880, 136249344, 13687492608, 5022425088, 693149184000, 472559616000, 18501259714560, 23441203298304, 4435759798272000, 1568692666368000
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.
AT&T Labs Research
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