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A156809 Number of nonisomorphic circle graphs of order n 2
1, 2, 4, 11, 34, 154, 978, 9497, 127954, 2165291, 42609994, 937233306 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

R. Arratia, B. Bollobas, D. Coppersmith, and G. B. Sorkin, Euler circuits and DNA sequencing by hybridization, Discrete Appl. Math., 104 (2000), 63-96.

Gi-Sang Cheon, Jinha Kim, Minki Kim, Sergey Kitaev, On k-11-representable graphs, arXiv:1803.01055 [math.CO], 2018.

L. E. Danielsen and M. G. Parker, Interlace polynomials: Enumeration, unimodality, and connections to codes, arXiv:0804.2576 [math.CO], 2008-2009.

L. E. Danielsen, Database of Circle Graphs.

CROSSREFS

Cf. A156808.

Sequence in context: A071115 A217043 A249696 * A215620 A076317 A076318

Adjacent sequences:  A156806 A156807 A156808 * A156810 A156811 A156812

KEYWORD

hard,nonn

AUTHOR

Lars Eirik Danielsen (larsed(AT)ii.uib.no), Feb 16 2009

STATUS

approved

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Last modified October 18 08:08 EDT 2019. Contains 328146 sequences. (Running on oeis4.)