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 A050142 #14 Feb 02 2020 21:40:58 %S A050142 1,1,1,1,1,1,2,2,2,3,2,3,4,6,9,4,6,6,9,12,18,8,8,12,18,22,33,38,16,16, %T A050142 22,28,42 %N A050142 Square array T(n,k) giving maximal numbers of codewords in mixed code with n binary coordinates and k ternary coordinates with Hamming distance 3, read by antidiagonals (n >= 0, k >= 0). %H A050142 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. %e A050142 Array begins: %e A050142 1, 1, 1, 3, 9, ... %e A050142 1, 1, 2, 6, 12, ... %e A050142 1, 2, 4, 9, 22, ... %e A050142 2, 3, 6, 18, 42, ... %e A050142 ... %Y A050142 Rows and columns give A057574-A057584. %K A050142 nonn,tabl,more %O A050142 0,7 %A A050142 _N. J. A. Sloane_, Oct 05 2000