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A034892
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Number of balanced signed graphs on n unlabeled nodes.
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2
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1, 1, 3, 8, 39, 226, 2283, 36789, 1062679, 55717077, 5405078682, 972656526492, 325183692812200, 202373967993972497, 235081289816026793049, 511296223391186047847309, 2088912833728676472658628201, 16081914207958884651686215477871, 234010862353438997655954463710225233
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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REFERENCES
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R. C. Read and R. J. Wilson, An Atlas of Graphs, Oxford, 1998.
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LINKS
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Andrew Howroyd, Table of n, a(n) for n = 0..50
Wikipedia, Signed graph
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FORMULA
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Euler transform of A318590.
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CROSSREFS
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Cf. A004102, A005142, A318590.
Sequence in context: A288759 A180368 A108262 * A072687 A260817 A262126
Adjacent sequences: A034889 A034890 A034891 * A034893 A034894 A034895
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KEYWORD
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nonn,nice
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AUTHOR
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R. C. Read (rcread(AT)math.uwaterloo.ca)
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EXTENSIONS
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Name clarified and offset corrected by Andrew Howroyd, Sep 25 2018
a(0)=1 prepended and terms a(13) and beyond from Andrew Howroyd, Sep 25 2018
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STATUS
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approved
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