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A109813
Number of permutations of (the positive integers <= n and coprime to n), where each element of the permutations is coprime to its adjacent elements.
+0
1
1, 1, 2, 2, 12, 2, 72, 24, 144, 12, 22032, 24, 476928, 480, 1728, 9600, 805146624, 720, 36481536000, 30240, 1728000, 312000, 192859121664000, 40320, 2159795404800, 46293120, 249684249600, 58423680
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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 7 08:40 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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