OFFSET
0,2
COMMENTS
There is no solution for a 15 X 15 (or larger) square. - Sean A. Irvine, Feb 13 2019
LINKS
R. Bacher and S. Eliahou, Extremal binary matrices without constant 2-squares (see p. 11).
R. Bacher and S. Eliahou, Extremal binary matrices without constant 2-squares, The Electronic Journal of Combinatorics, Open Journal Systems, 2010, 1 (1), pp.77-100. See p. 87.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
EXTENSIONS
a(0)=1 from Alois P. Heinz, Feb 19 2015
More terms from Bacher and Eliahou paper added by Sean A. Irvine, Feb 13 2019
STATUS
approved