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 A066140 #11 Feb 02 2020 21:28:09 %S A066140 3,6,12,20,30,45,63,84 %N A066140 Covering numbers C(n,n-3,n-4). %C A066140 C(v,k,t) is the smallest number of k-subsets of an n-set such that every t-subset is contained in at least one of the k-subsets. %D A066140 CRC Handbook of Combinatorial Designs, 1996, p. 263. %D A066140 W. H. Mills and R. C. Mullin, Coverings and packings, pp. 371-399 of Jeffrey H. Dinitz and D. R. Stinson, editors, Contemporary Design Theory, Wiley, 1992. %H A066140 D. Gordon, <a href="http://www.dmgordon.org/cover">La Jolla Repository of Coverings</a> %H A066140 K. J. Nurmela and Patric R. J. Östergård, <a href="http://www.tcs.hut.fi/old/papers/tp1.ps.Z">New coverings of t-sets with (t+1)-sets</a>, J. Combinat. Designs, 7 (1999), 217-226. %H A066140 K. J. Nurmela and Patric R. J. Östergård, <a href="http://www.tcs.hut.fi/old/papers/table3.html">New coverings of t-sets with (t+1)-sets (appendix)</a>, J. Combinat. Designs, 7 (1999), 217-226. %H A066140 <a href="/index/Cor#covnum">Index entries for covering numbers</a> %Y A066140 A column of A066010. %K A066140 nonn %O A066140 5,1 %A A066140 _N. J. A. Sloane_