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A185194 Number of unlabeled digraphs on n vertices such that every vertex has outdegree 4. 5
0, 0, 0, 0, 1, 40, 35317, 56150820, 111359017198, 278086517599356, 877760741062694898, 3482578978170418753715, 17204168691253789080138981, 104690934973509839187285618311, 776311587313178356520412354767734, 6942595716239018207126337605515965388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

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=4 of A329228.

Cf. A001373, A129524, A185193, A185303.

Sequence in context: A204682 A205158 A205307 * A214138 A239168 A167061

Adjacent sequences:  A185191 A185192 A185193 * A185195 A185196 A185197

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 22:26 EDT 2020. Contains 337440 sequences. (Running on oeis4.)