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 A011976 #16 Jul 08 2025 02:44:39 %S A011976 1,3,3,5,6,8,9,11,12,13,18,19,20,26,27,31,35,37,39,46,48,50,59,61,63, %T A011976 73,75,78,88,91,94,105,108,111,124,127,130,144,147,151,165,169,173, %U A011976 188,192,196,213,217,221,239,243,248,266,271,276,295,300,305,326 %N A011976 Covering numbers C(n,4,2). %C A011976 Only differs from A240115 when n = 7, 9, 10, or 19. - _Nathaniel Johnston_, Jan 10 2024 %D A011976 CRC Handbook of Combinatorial Designs, 1996, p. 262. %H A011976 D. Gordon, <a href="http://www.dmgordon.org/cover">La Jolla Repository of Coverings</a> %H A011976 <a href="/index/Cor#covnum">Index entries for covering numbers</a> %Y A011976 Cf. A011975, A011977. %K A011976 nonn,easy %O A011976 4,2 %A A011976 _N. J. A. Sloane_ %E A011976 a(21)-a(62) from _Nathaniel Johnston_, Jan 10 2024