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 A074404 #15 Jul 22 2025 11:13:42 %S A074404 0,0,0,1,8,36,160,548,1920,6496,23040,84565,317440,1197824,4508328, %T A074404 16905344,63406080,238602228,902430720,3429249843,13076616480, %U A074404 49977704448,191312691200,733365135860,2815436626328,10825959342080,41694904974720,160823207301705 %N A074404 Number of 4-ary Lyndon words of length n over Z_4 with trace 0 and subtrace 2. %H A074404 Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a> %H A074404 F. Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a> %Y A074404 Cf. A068596, A074403, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074412, A074413. %K A074404 easy,nonn %O A074404 1,5 %A A074404 _Frank Ruskey_ and Nate Kube, Aug 22 2002 %E A074404 Terms a(15) onward from _Max Alekseyev_, Apr 09 2013