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A156808 Number of nonisomorphic connected circle graphs of order n 3
1, 1, 2, 6, 21, 110, 789, 8336, 117283, 2026331, 40302425, 892278076 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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.

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. A156809.

Sequence in context: A079129 A305923 A130275 * A245882 A267653 A245880

Adjacent sequences:  A156805 A156806 A156807 * A156809 A156810 A156811

KEYWORD

hard,nonn

AUTHOR

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

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)