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 A074407 #15 Jul 22 2025 11:13:59 %S A074407 0,0,0,4,16,53,169,512,1706,6144,23040,87380,327680,1217097,4509419, %T A074407 16777216,62914560,237677216,902430720,3435973836,13102206738, %U A074407 50026607709,191312873561,733007751680,2814062572336,10823317585920,41694904974720,160842843834660 %N A074407 Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 1. %C A074407 Same as the number of 4-ary Lyndon words of length n over Z_4 with trace 3 and subtrace 1. %H A074407 Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a> %H A074407 F. Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a> %Y A074407 Cf. A068596, A074403, A074404, A074405, A074406, A074408, A074409, A074410, A074411, A074412, A074413. %K A074407 easy,nonn %O A074407 1,4 %A A074407 _Frank Ruskey_ and Nate Kube, Aug 22 2002 %E A074407 Terms a(15) onward from _Max Alekseyev_, Apr 09 2013