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A185193 Number of unlabeled digraphs on n vertices such that every vertex has outdegree 3. 5
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 January 29 08:12 EST 2020. Contains 331337 sequences. (Running on oeis4.)