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 A057576 #11 Feb 02 2020 21:42:37 %S A057576 3,6,9,18,28,54,108 %N A057576 Maximal numbers of codewords in mixed code with n binary coordinates and 3 ternary coordinates with Hamming distance 3. %H A057576 Patric R. J. Östergård, <a href="https://users.aalto.fi/~pat/23.html">Classification of small binary/ternary one-error-correcting codes (Appendix)</a>, Discrete Mathematics 223 (2000), 253-262. %Y A057576 Cf. A057574-A057584, A050142. %K A057576 nonn,more %O A057576 0,1 %A A057576 _N. J. A. Sloane_, Oct 04 2000