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A219895
Number of directed 3-regular graphs on n nodes without directed 2-cycles.
1
3, 26, 1547, 146487, 16018987, 1985766270, 278601715904
OFFSET
7,1
LINKS
Gunnar Brinkmann, Generating regular directed graphs, Discrete Math., 313 (2012), 1-7.
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Nov 30 2012
STATUS
approved