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A006608
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Number of n-node graphs not determined by their spectrum.
(Formerly M1981)
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4
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0, 0, 0, 0, 2, 10, 110, 1722, 51039, 2560606, 215331676, 31067572481
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,5
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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