See Graver-Yackel for definition.
It is known that a(8) is in [26-29], a(9) is 35 or 36.
Differs by 1 from the list provided by A000791. - Ray G. Opao, Jun 24 2012
Table of n, a(n) for n=3..7.
Jack E. Graver and James Yackel, Some graph theoretic results associated with Ramsey's theorem. J. Combinatorial Theory 4 1968 125--175. MR0225685 (37 #1278)
Eric W. Weisstein, MathWorld: Ramsey Number
Sequence in context: A314426 A314427 A314428 * A314429 A314430 A314431
Adjacent sequences: A210237 A210238 A210239 * A210241 A210242 A210243
N. J. A. Sloane, Mar 19 2012