OFFSET
1,2
COMMENTS
A lower bound on A121231(n), the maximal number of 1's in any (0,1)-matrix M such that M^2 is also a (0,1)-matrix.
For example, for m^2 x m^2 matrices one can obtain a(m^2) = m^3 using m^2 m x m matrices with one row of m of 1's and (m-1) rows of m of 0's.
CROSSREFS
KEYWORD
nonn
AUTHOR
Dan Dima, Aug 24 2006
EXTENSIONS
Edited by R. J. Mathar, Oct 01 2008
STATUS
approved