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 A011977 #16 Jul 08 2025 02:44:47 %S A011977 1,3,3,4,5,6,7,9,10,12,13,15,16,18,19,21,21,27,28,30,30,37,38,40 %N A011977 Covering numbers C(n,5,2). %C A011977 It is known that 42 <= a(29) <= 43. The next few values are known: a(30) = 48, a(31) = 50, a(32) = 52. - _Nathaniel Johnston_, Jan 10 2024 %D A011977 CRC Handbook of Combinatorial Designs, 1996, p. 262. %H A011977 D. Gordon, <a href="http://www.dmgordon.org/cover">La Jolla Repository of Coverings</a> %H A011977 Uenal Mutlu (uenalm(AT)metronet.de), <a href="http://www.tuco.de/math1.htm">Tables of coverings</a> %H A011977 <a href="/index/Cor#covnum">Index entries for covering numbers</a> %Y A011977 Cf. A011975, A240116. %K A011977 nonn,hard %O A011977 5,2 %A A011977 _N. J. A. Sloane_ %E A011977 a(28) from _Nathaniel Johnston_, Jan 10 2024