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 A121377 #16 Oct 21 2022 10:09:24 %S A121377 48,49,50,51,52,53,54,55,56,57 %N A121377 ASCII codes for decimal digits. %H A121377 ASCII, <a href="http://www.ascii.cl/">Codes Table</a> %H A121377 Wikipedia, <a href="http://en.wikipedia.org/wiki/ASCII">ASCII</a> %F A121377 a(n) = A121378(n) - 192. %e A121377 BIN: 110000, 110001, 110010, 110011, 110100, 110101, 110110, 110111, 111000, 111001; %e A121377 OCT: 60, 61, 62, 63, 64, 65, 66, 67, 70, 71; %e A121377 HEX: 30, 31, 32, 33, 34, 35, 36, 37, 38, 39. %o A121377 (Python) def a(n): return 47+n # _Martin Gergov_, Oct 21 2022 %Y A121377 Cf. A121378. %K A121377 nonn,base,fini,full %O A121377 1,1 %A A121377 _Reinhard Zumkeller_, Jul 25 2006