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A178845 - OEIS
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A178845
Number of permutations of 2..n+1 with no element divisible by an adjacent element.
0
1, 2, 2, 12, 20, 180, 648, 5784, 36936, 485040, 2034876, 33492048, 373375392, 4974252864, 52465459392, 1067273994240, 11538658531008, 260749481442240
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..18.
CROSSREFS
Sequence in context:
A302368
A346757
A202669
*
A140431
A092900
A303537
Adjacent sequences:
A178842
A178843
A178844
*
A178846
A178847
A178848
KEYWORD
nonn
AUTHOR
R. H. Hardin
Jun 17 2010
STATUS
approved
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Last modified August 18 05:18 EDT 2024. Contains 375255 sequences. (Running on oeis4.)