A128238 Number of n-node (unlabeled) graphs with girth 5.
0, 0, 1, 2, 8, 26, 101, 396, 1744, 8531, 47803, 308086, 2300756, 19909540, 199365557
Offset: 3
Programs
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nauty
geng -tfq $n | countg -qg5 --ng # Martin Fuller, May 03 2015
Extensions
Corrected and extended by Martin Fuller, May 01 2015