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A128237 Number of n-node (unlabeled) graphs with girth 4. 1
0, 1, 3, 15, 60, 297, 1618, 11359 (list; graph; refs; listen; history; internal format)
OFFSET

3,3

CROSSREFS

Cf. A128041, A128042, A128236-A128243.

Sequence in context: A058748 A049314 A001655 * A058749 A072336 A122671

Adjacent sequences:  A128234 A128235 A128236 * A128238 A128239 A128240

KEYWORD

nonn

AUTHOR

Keith M. Briggs, May 05 2007

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.