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A128241 Number of n-node (unlabeled) connected graphs with girth 4. 0
0, 1, 2, 11, 42, 220, 1254, 9412 (list; graph; refs; listen; history; internal format)
OFFSET

3,3

CROSSREFS

Cf. A128041, A128042, A128236-A128243.

Sequence in context: A089658 A140322 A027247 * A141190 A048500 A197189

Adjacent sequences:  A128238 A128239 A128240 * A128242 A128243 A128244

KEYWORD

nonn

AUTHOR

Keith M. Briggs, May 05 2007

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Last modified February 16 10:53 EST 2012. Contains 205904 sequences.