1,3

There is an easy formula for prime orders. Formulae are also known for square-free and prime-squared orders. The subsequent values for orders 29,31 are 596,1096.

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 square-free orders

R. Poeschel, Publications

Cf. A049288, A049289, A049297.

Sequence in context: A032243 A153922 A153943 this_sequence A022405 A093927 A067088

Adjacent sequences: A049306 A049307 A049308 this_sequence A049310 A049311 A049312

nice,nonn

V. A. Liskovets (liskov(AT)im.bas-net.by)

Further values for (twice) square-free and (twice) prime-squared orders can be found in the Liskovets reference.