Abstract
We systematize, extend, and survey results of the analytical (i.e. represented by formulae) exact enumeration of circulant graphs. A convenient unified approach to counting various types of circulant graphs possessing the so-called Cayley isomorphism (CI) property is proposed. The results are represented uniformly in terms of well-specified Abelian permutation groups and their cycle index polynomials. This technique comprises mostly square-free orders, but it may be generalized to prime-squared (and also prime-power) orders, due to an isomorphism criterion for circulants of these orders. In the last section we provide vast numerical tables and suggest two conjectures.
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