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 A187567 #18 Nov 25 2018 11:56:22 %S A187567 0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,18,0,0 %N A187567 Number of Steiner Systems S(2,4,n). %C A187567 S(2,4,n) exists if and only if n == 1 or 4 (mod 12). %C A187567 a(28) >= 4653. %H A187567 Colin Reid and Alex Rosa, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/DS18">Steiner systems S(2,4,v) - a survey</a>, Electronic Journal of Combinatorics, Dynamic Survey DS18, Feb 01 2010. %H A187567 E. Spence, <a href="https://doi.org/10.1002/(SICI)1520-6610(1996)4:4%3C295::AID-JCD6%3E3.0.CO;2-A">The complete classification of Steiner Systems S(2,4,25)</a>, J. Combin. Designs, 4 (1996), 295-300. %H A187567 <a href="/index/St#Steiner">Index entries for sequences related to Steiner systems</a> %Y A187567 Cf. A187585, A001201, A030129. %K A187567 nonn,more %O A187567 1,25 %A A187567 _N. J. A. Sloane_, Mar 11 2011