2,2

P. Frankl et al., Projecting a finite point-set..., Ryukyu Math. J. 8 (1995), 27-35.

R. L. Graham and N. J. A. Sloane, On Additive Bases and Harmonious Graphs, SIAM J. Algebraic and Discrete Methods, 1 (1980), 382-404.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Table of n, a(n) for n=2..11.

R. L. Graham and N. J. A. Sloane, On Additive Bases and Harmonious Graphs

Sean A. Irvine, Example sets for a(2) to a(11)

Sequence in context: A235269 A004137 A080060 * A171514 A032782 A310157

Adjacent sequences: A004128 A004129 A004130 * A004132 A004133 A004134

nonn

N. J. A. Sloane.

a(11) from Sean A. Irvine, Dec 07 2015

approved