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N. Alon et al., Quadratic forms on graphs, Inventiones Math., 163 (2006), 499-522.
Table of n, a(n) for n=1..102.
Simon Plouffe, Grothendieck's majorant
Eric Weisstein's World of Mathematics, Grothendieck's Constant
RealDigits[Pi/(2*Log[1 + Sqrt]), 10, 111][] (* Robert G. Wilson v, May 19 2004 *)
Sequence in context: A154169 A245260 A128755 * A196610 A198938 A244067
Adjacent sequences: A088364 A088365 A088366 * A088368 A088369 A088370
Eric W. Weisstein, Sep 27 2003
Edited by N. J. A. Sloane, Oct 01 2006