R(6,9) > 152

Construct a circulant graph on 152 vertices with vertices labeled with 0 to 151. For i > j, the edge joining i and j is colored in the first color if either i - j or 152 - (i - j) is one of the following values:

  4,  6, 10, 11, 12, 15, 16, 19, 21, 22
 24, 26, 31, 34, 36, 40, 42, 43, 47, 49
 50, 52, 53, 54, 60, 64, 66, 67, 69, 70
 72

Otherwise the edge receives color two. There are no K6's in the first color and no K9's in the second color.

Geoff Exoo