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 A074411 #15 Jul 22 2025 11:14:20 %S A074411 0,0,2,4,16,36,128,440,1706,6560,24576,90046,327680,1197824,4438966, %T A074411 16645120,62914560,238609052,905969664,3442670796,13102206738, %U A074411 49977704448,191126044672,732649663000,2814062572336,10825960652800,41705086880768,160862475611574 %N A074411 Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 1. %H A074411 Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a> %H A074411 F. Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a> %Y A074411 Cf. A068596, A074403, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074412, A074413. %K A074411 easy,nonn %O A074411 1,3 %A A074411 _Frank Ruskey_ and Nate Kube, Aug 22 2002 %E A074411 Terms a(15) onward from _Max Alekseyev_, Apr 09 2013