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 A074412 #15 Jul 22 2025 11:14:26 %S A074412 0,0,0,0,8,40,160,576,1920,6528,23040,84480,317440,1198080,4508328, %T A074412 16908288,63406080,238605640,902430720,3429236736,13076616480, %U A074412 49977753600,191312691200,733365665600,2815436626328,10825959997440,41694904974720,160823204904960 %N A074412 Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 2. %H A074412 Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a> %H A074412 F. Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a> %Y A074412 Cf. A068596, A074403, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074413. %K A074412 easy,nonn %O A074412 1,5 %A A074412 _Frank Ruskey_ and Nate Kube, Aug 22 2002 %E A074412 Terms a(15) onward from _Max Alekseyev_, Apr 09 2013