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A185193
Number of unlabeled digraphs on n vertices such that every vertex has outdegree 3.
6
0, 0, 0, 1, 13, 1499, 257290, 56150820, 14971125930, 4829990898461, 1864386642498918, 851204815909786099, 454661054439318678263, 281270600132956104641972, 199701092658236514672384967, 161392692052798327047616107614, 147373164027242947672475065773269
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..50
L. Travis, [math/9811127] Graphical Enumeration: A Species-Theoretic Approach
CROSSREFS
Column k=3 of A329228.
Cf. A001373, A129524, A185194, A185303.
Sequence in context: A201357 A220551 A185073 * A066457 A203515 A166929
Adjacent sequences: A185190 A185191 A185192 * A185194 A185195 A185196
KEYWORD
nonn
AUTHOR
Nathaniel Johnston, Feb 08 2012
EXTENSIONS
Terms a(10) and beyond from Andrew Howroyd, Nov 08 2019
STATUS
approved

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Last modified September 30 09:16 EDT 2024. Contains 376328 sequences.
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