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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
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OFFSET
7,1
LINKS
Table of n, a(n) for n=7..13.
Gunnar Brinkmann,
Generating regular directed graphs
, Discrete Math., 313 (2012), 1-7.
CROSSREFS
Cf.
A096368
,
A219889
,
A219890
,
A219891
,
A219892
,
A219893
,
A219894
.
Sequence in context:
A354652
A174811
A214808
*
A088730
A058956
A010257
Adjacent sequences:
A219892
A219893
A219894
*
A219896
A219897
A219898
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Nov 30 2012
STATUS
approved
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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)