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 A034233 #13 Jul 08 2025 20:11:43 %S A034233 1,1,2,4,10,13,23,26,32,26,23,13,10,4,2,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A034233 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A034233 0,0,0,0,0,0,0,0,0 %N A034233 Number of quaternary codes of length 2 with n words. %H A034233 H. Fripertinger, <a href="http://www.mathe2.uni-bayreuth.de/frib/codes/tables.html">Isometry Classes of Codes</a> %H A034233 H. Fripertinger, <a href="https://doi.org/10.1023/A:1008248618779">Enumeration, construction and random generation of block codes</a>, Designs, Codes, Crypt., 14 (1998), 213-219. %Y A034233 Cf. A034188-. %K A034233 nonn %O A034233 0,3 %A A034233 _N. J. A. Sloane_ %E A034233 Missing a(16)=1 inserted by _Sean A. Irvine_, Aug 08 2020