OFFSET
0,4
COMMENTS
Further values for (twice) squarefree and (twice) prime-squared orders can be found in the Liskovets reference.
LINKS
V. A. Liskovets, Some identities for enumerators of circulant graphs, arXiv:math/0104131 [math.CO], 2001.
V. A. Liskovets and R. Poeschel, On the enumeration of circulant graphs of prime-power and squarefree orders
R. Poeschel, Publications
CROSSREFS
KEYWORD
nonn,more,nice
AUTHOR
STATUS
approved