The best known vertex transitive digraphs (as of October 2008) in the directed Degree diameter problem are tabulated below.

Table of the orders of the largest known vertex-symmetric graphs for the directed degree diameter problem

Key to colors

References

* * * * * * {{citation , last1 = Loz , first1 = Eyal , last2 = Širáň , first2 = Jozef , title = New record graphs in the degree-diameter problem , journal = Australasian Journal of Combinatorics , volume = 41 , year = 2008 , pages = 63–80 , url = http://ajc.maths.uq.edu.au/pdf/41/ajc_v41_p063.pdf

External links

Vertex-symmetric Digraphs
online table.
The Degree - Diameter Problem on CombinatoricsWiki.org

Eyal Loz's
Degree-Diameter problem page. Directed graphs