A128243 Number of n-node (unlabeled) connected graphs with girth 6.

0, 0, 0, 1, 1, 6, 17, 69, 239, 962, 3864, 17049, 79607, 403758, 2209386, 13138818, 84841130, 595825731

Offset

3,6

Links

Table of n, a(n) for n=3..20.

Prog

(nauty) geng -ctfq $n | countg -qg6 --ng # Martin Fuller, May 03 2015

Crossrefs

Cf. A128041, A128042.

Cf. A128236, A128237, A128238, A128239, A128240, A128241, A128242.

Sequence in context: A123189 A219847 A047156 * A219294 A338747 A154494

Adjacent sequences: A128240 A128241 A128242 * A128244 A128245 A128246

Keyword

nonn,more

Author

Keith Briggs, May 05 2007

Extensions

Corrected and extended by Martin Fuller, May 01 2015

a(18)-a(20) added by Georg Grasegger, May 02 2023

Status

approved