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A219890
Number of directed 3-regular graphs on n nodes.
8
1, 2, 23, 415, 19041, 1104045, 79818336, 6958257941, 720814138673, 87579097910309
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OFFSET
4,2
LINKS
Table of n, a(n) for n=4..13.
Gunnar Brinkmann,
Generating regular directed graphs
, Discrete Math., 313 (2012), 1-7.
CROSSREFS
Column k=3 of
A350910
.
Cf.
A096368
,
A219889
,
A219890
,
A219891
,
A219892
,
A219893
.
Sequence in context:
A266923
A060941
A338178
*
A119774
A074649
A233211
Adjacent sequences:
A219887
A219888
A219889
*
A219891
A219892
A219893
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Nov 30 2012
STATUS
approved
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Last modified September 15 09:55 EDT 2024. Contains 375932 sequences. (Running on oeis4.)