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 A057580 #16 Feb 02 2020 21:41:45 %S A057580 1,2,4,9,22 %N A057580 Maximal numbers of codewords in mixed code with 2 binary coordinates and n ternary coordinates with Hamming distance 3. %C A057580 Is this sequence equal to A105633? - _Paul D. Hanna_, Apr 17 2005 %H A057580 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 A057580 Cf. A057574-A057584, A050142. %K A057580 nonn,more %O A057580 0,2 %A A057580 _N. J. A. Sloane_, Oct 04 2000