A128242 Number of n-node (unlabeled) connected graphs with girth 5.

0, 0, 1, 1, 5, 16, 66, 266, 1235, 6350, 37364, 251106, 1942085, 17287710, 177086792, 2084120446, 28125888087, 434318629496, 7657513894860

Offset

3,5

Links

Table of n, a(n) for n=3..21.

Prog

(nauty) geng -ctfq $n | countg -qg5 --ng # Martin Fuller, May 03 2015

Crossrefs

Cf. A128041, A128042.

Cf. A128236, A128237, A128238, A128239, A128240, A128241, A128243.

Sequence in context: A349568 A026525 A007043 * A323934 A166932 A027105

Adjacent sequences: A128239 A128240 A128241 * A128243 A128244 A128245

Keyword

nonn,more

Author

Keith Briggs, May 05 2007

Extensions

Corrected and extended by Martin Fuller, May 01 2015

a(18)-a(21) added by Georg Grasegger, May 02 2023

Status

approved