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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
OFFSET
1,5
CROSSREFS
Column k=3 of A329228.
Sequence in context: A201357 A220551 A185073 * A066457 A203515 A166929
KEYWORD
nonn
AUTHOR
Nathaniel Johnston, Feb 08 2012
EXTENSIONS
Terms a(10) and beyond from Andrew Howroyd, Nov 08 2019
STATUS
approved