%I A049287
%S A049287 1,2,2,4,3,8,4,12,8,20,8,48,14,48,44,84,36,192,60,336,200,416,188,1312,
%T A049287 423,1400,928,3104,1182,8768,2192,8364,6768,16460,11144,46784,14602,
%U A049287 58288,44424,136128,52488,355200,99880,432576,351424,762608,364724
%N A049287 Number of nonisomorphic circulant graphs, i.e. undirected Cayley graphs 
               for the cyclic group of order n.
%H A049287 V. A. Liskovets, <a href="http://front.math.ucdavis.edu/math.CO/0104131">
               Some identities for enumerators of circulant graphs</a>.
%H A049287 V. A. Liskovets and R. Poeschel, <a href="ftp://ftp.math.tu-dresden.de/
               pub/reports/alg/poeschel/lispoepp.ps">On the enumeration of circulant 
               graphs of prime-power and square-free orders</a>
%H A049287 R. Poeschel, <a href="http://www.math.tu-dresden.de/~poeschel/Publikationen.html">
               Publications</a>
%H A049287 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CirculantGraph.html">Link to a section of The World of Mathematics.</
               a>
%H A049287 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CirculantMatrix.html">Link to a section of The World of Mathematics.</
               a>
%F A049287 There is an easy formula for prime orders. Formulae are also known for 
               square-free and prime-squared orders.
%Y A049287 Cf. A049297, A049288-A049289.
%Y A049287 Sequence in context: A048675 A162474 A048676 this_sequence A006799 A056429 
               A133806
%Y A049287 Adjacent sequences: A049284 A049285 A049286 this_sequence A049288 A049289 
               A049290
%K A049287 nonn,nice
%O A049287 1,2
%A A049287 V. A. Liskovets (liskov(AT)im.bas-net.by)
%E A049287 Further values for (twice) square-free and (twice) prime-squared orders 
               can be found in the Liskovets reference.