A006624 a(n) is the least k such that every n X (n+3) {0,1}-matrix with k ones contains an all-ones 2 X 4 submatrix.

9, 14, 20, 27, 33, 41, 49, 57

Offset: 2

Author

N. J. A. Sloane

Keywords

• nonn
• more

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).

Extensions

Replaced definition with more precise version from a comment of Sean A. Irvine from May 18 2017. - N. J. A. Sloane, Feb 04 2024