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A038788
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Non-Cayley-isomorphic circulant self-complementary directed p^2-graphs, indexed by odd primes p.
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3
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1, 4, 4, 16, 64, 400, 900, 8836, 355216, 1201216, 53523856, 690217984, 2494003600, 33255899044, 1666350520384, 85680866908816, 320296595636224, 16939175556745744, 240937075998869056, 910964509740273664, 49676441991516395584, 719170624451273114176
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listen;
history;
text;
internal format)
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OFFSET
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1,2
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REFERENCES
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V. A. Liskovets and R. Poeschel, Non-Cayley-isomorphic self-complementary circulant graphs, J. Graph Th., 34, 2000, 128-141.
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LINKS
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FORMULA
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a(p^2) = ( (1/(p-1)) * Sum_{r|p-1 and r even} phi(r) * 2^((p-1)/r) )^2. - Sean A. Irvine, Feb 14 2021
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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