

A339505


Number of nonisomorphic connected cubic cyclic Haar graphs of girth 6 on 2n vertices.


0



0, 0, 0, 0, 1, 1, 1, 1, 1, 3, 2, 2, 4, 3, 2, 4, 3, 5, 6, 4, 3, 9, 4, 5, 5, 7, 4, 11
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OFFSET

3,10


COMMENTS

a(n) is also the number of connected cyclic configurations of type (n_3)
Sequence A098822 counts all cyclic configurations of type (n_3), while the present sequence counts only those that are connected.


LINKS

Table of n, a(n) for n=3..30.
N. Bašić, J. Grošelj, B. Grünbaum and T. Pisanski, Splittable and unsplittable graphs and configurations, Ars Math. Contemp. 16 (2019), 117.
M. Petkovšek and T. Pisanski, Counting disconnected structures: chemical trees, fullerenes, Igraphs and others, Croatica Chem. Acta 78 (2005), 563567.


CROSSREFS

Cf. A098822.
Sequence in context: A237612 A111739 A182214 * A351163 A216161 A332502
Adjacent sequences: A339502 A339503 A339504 * A339506 A339507 A339508


KEYWORD

nonn,more


AUTHOR

Nino Basic, Dec 07 2020


STATUS

approved



