OFFSET
0,5
LINKS
CROSSREFS
Not necessarily connected k-regular simple graphs girth exactly 4: A198314 (any k), A185644 (triangle); fixed k: A026797 (k=2), this sequence (k=3), A185144 (k=4).
KEYWORD
nonn,hard,more
AUTHOR
Jason Kimberley, Mar 21 2012
STATUS
approved