A185194 Number of unlabeled digraphs on n vertices such that every vertex has outdegree 4.

0, 0, 0, 0, 1, 40, 35317, 56150820, 111359017198, 278086517599356, 877760741062694898, 3482578978170418753715, 17204168691253789080138981, 104690934973509839187285618311, 776311587313178356520412354767734, 6942595716239018207126337605515965388

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