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A219891
Number of directed 4-regular graphs on n nodes.
7
1, 4, 92, 19041, 6510087, 2983458766, 1775668832509, 1349509467853512
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OFFSET
5,2
LINKS
Table of n, a(n) for n=5..12.
Gunnar Brinkmann,
Generating regular directed graphs
, Discrete Math., 313 (2012), 1-7.
CROSSREFS
Column k=4 of
A350910
.
Cf.
A096368
,
A219889
,
A219890
,
A219892
,
A219893
.
Sequence in context:
A012135
A221287
A177411
*
A050878
A173362
A353089
Adjacent sequences:
A219888
A219889
A219890
*
A219892
A219893
A219894
KEYWORD
nonn
,
more
AUTHOR
N. J. A. Sloane
, Nov 30 2012
STATUS
approved
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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)