This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A006615 M4960 #24 Mar 22 2024 18:04:00
%S A006615 15,22,31,38,46,57
%N A006615 A variant of Zarankiewicz's problem: a(n) is the least k such that every n X n {0,1}-matrix with k ones contains an all-ones 3 X 4 submatrix.
%D A006615 R. K. Guy, A many-facetted problem of Zarankiewicz, Lect. Notes Math. 110 (1969), 129-148.
%D A006615 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%Y A006615 Cf. A006613, A006614, A006616, A006617, A006618, A006619, A006620, A006621, A006622, A006623, A006624, A006625, A006626.
%Y A006615 Cf. A001197, A072567, A191965, A191873, A001198, A205805, A347473, A347474, A350304, A350237.
%K A006615 nonn,more
%O A006615 4,1
%A A006615 _N. J. A. Sloane_
%E A006615 Name changed at the suggestion of _Sean A. Irvine_ and a(9) added by _Max Alekseyev_, Feb 02 2024