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A168078
Number of matrices with elements 1..n in which every pair of adjacent elements are relatively prime
1
1, 4, 12, 32, 144, 176, 1728, 4320, 27936
OFFSET
1,2
COMMENTS
For prime p, a(p) = 2*A076220(p)
CROSSREFS
KEYWORD
more,nonn
AUTHOR
Lior Manor, Nov 18 2009
STATUS
approved