OFFSET
4,1
COMMENTS
a(n) is the least k such that every n X (n-1) {0,1}-matrix with k ones contains an all ones 2 X 3 submatrix. - Sean A. Irvine, May 18 2017
REFERENCES
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).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
STATUS
approved