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A049309 Number of nonisomorphic self-complementary circulant digraphs (Cayley digraphs for the cyclic group) of order 2n-1. 3
1, 1, 2, 2, 3, 4, 8, 20, 20, 30, 88, 94, 214, 457, 596, 1096, 3280, 5560, 7316, 21944, 26272, 49940 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
There is an easy formula for prime orders. Formulae are also known for squarefree and prime-squared orders.
Further values for squarefree and 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.
R. Poeschel, Publications
CROSSREFS
Sequence in context: A153922 A153943 A361117 * A239967 A307891 A205118
KEYWORD
nice,nonn
AUTHOR
EXTENSIONS
a(14)-a(22) from Andrew Howroyd, May 06 2017
STATUS
approved

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Last modified March 29 03:39 EDT 2024. Contains 371264 sequences. (Running on oeis4.)