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 A086266 #11 Feb 16 2025 08:32:50 %S A086266 1,1,1,13,2,1,218,208,78,6,1,1,11506,21172,20262,9560,2593,408,32,2 %N A086266 Triangle of counts of s-clusters in n X n (0,1)-matrices for s=0, 1, .... %H A086266 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/s-Cluster.html">s-Cluster</a> %e A086266 Triangle begins: %e A086266 1, 1; %e A086266 1, 13, 2; %e A086266 1, 218, 208, 78, 6, 1; %e A086266 1, 11506, 21172, 20262, 9560, 2593, 408, 32, 2; %e A086266 ... %Y A086266 Cf. A086265. %K A086266 nonn,tabf,more %O A086266 1,4 %A A086266 _Eric W. Weisstein_, Jul 14 2003