2,1
R. K. Guy, A many-facetted problem of Zarankiewicz, Lect. Notes Math. 110 (1969), 129-148.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Sequence in context: A187682 A007944 A200269 * A140695 A085681 A068919
Adjacent sequences: A006614 A006615 A006616 * A006618 A006619 A006620
nonn
N. J. A. Sloane (njas(AT)research.att.com).