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 2 3 4 5 6 7 8 9 10 11 2 6Family of digraphs found by . 10Cayley digraphs found by Michael J. Dinneen. Details about these graphs are available in a paper by the author. 20Cayley digraphs found by Michael J. Dinneen. The complete set of Cayley digraphs in that order was found by Eyal Loz. 27 72 Cayley digraphs found by Paul Hafner. Details about these graphs are available in a paper by the author. 144 171 336Family of digraphs found by . 504 737 3 12 27 60Digraph found by . The complete set of Cayley digraphs in that order was found by Eyal Loz. 165Cayley digraph found by Paul Hafner. The complete set of Cayley digraphs in that order was found by Eyal Loz. 333 1 152Digraphs found by . 2 041Cayley digraphs found by Eyal Loz. More details are available in . 5 115 11 568 41 472 4 20 60 168 465 1 378 7 200 14 400Digraphs found by J. Gómez. 42 309 137 370 648 000 5 30 120 360 1 152 3 775 28 800 86 400 259 200 1 010 658 5 184 000 6 42 210 840 2 520 9 020 88 200 352 800 1 411 200 5 184 000 27 783 000 7 56 336 1 680 6 720 20 160 225 792 1 128 960 5 644 800 27 783 000 113 799 168 8 72 504 3 024 15 120 60 480 508 032 3 048 192 18 289 152 113 799 168 457 228 800 9 90 720 5 040 30 240 151 200 1 036 800 7 257 600 50 803 200 384 072 192 1 828 915 200 10 110 990 7 920 55 400 332 640 1 960 200 15 681 600 125 452 800 1 119 744 000 6 138 320 000 11 132 1 320 11 880 95 040 665 280 3 991 680 31 152 000 282 268 800 2 910 897 000 18 065 203 200 12 156 1 716 17 160 154 440 1 235 520 8 648 640 58 893 120 588 931 200 6 899 904 000 47 703 427 200 13 182 2 184 24 024 240 240 2 162 160 17 297 280 121 080 960 1 154 305 152 15 159 089 098 115 430 515 200
The footnotes in the table indicate the origin of the digraph that achieves the given number of vertices:
References
External links Vertex-symmetric Digraphs online table. The Degree - Diameter Problem on CombinatoricsWiki.org. Eyal Loz's Degree-Diameter problem page.