0,4
V. A. Liskovets, Some identities for enumerators of circulant graphs.
V. A. Liskovets and R. Poeschel, On the enumeration of circulant graphs of prime-power and squarefree orders
R. Poeschel, Publications
Cf. A049297, A049287, A049288.
Sequence in context: A021810 A073800 A076813 * A099890 A137511 A011166
Adjacent sequences: A049286 A049287 A049288 * A049290 A049291 A049292
nonn,nice
V. A. Liskovets (liskov(AT)im.bas-net.by)
Further values for (twice) squarefree and (twice) prime-squared orders can be found in the Liskovets reference.