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A034892 Number of balanced signed graphs on n unlabeled nodes. 2
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)
OFFSET

0,3

REFERENCES

R. C. Read and R. J. Wilson, An Atlas of Graphs, Oxford, 1998.

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..50

Wikipedia, Signed graph

FORMULA

Euler transform of A318590.

CROSSREFS

Cf. A004102, A005142, A318590.

Sequence in context: A288759 A180368 A108262 * A072687 A260817 A262126

Adjacent sequences:  A034889 A034890 A034891 * A034893 A034894 A034895

KEYWORD

nonn,nice

AUTHOR

R. C. Read (rcread(AT)math.uwaterloo.ca)

EXTENSIONS

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

STATUS

approved

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Last modified January 15 12:14 EST 2021. Contains 340187 sequences. (Running on oeis4.)