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 A074406 #15 Jul 22 2025 11:13:54 %S A074406 1,1,2,4,8,32,128,512,1948,6963,24576,87380,317440,1179648,4438966, %T A074406 16777216,63409935,239541344,905969664,3435973836,13076616480, %U A074406 49928994816,191126044672,733007751680,2815437297416,10828603699515,41705086880768,160842843834660 %N A074406 Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 0. %C A074406 Same as the number of 4-ary Lyndon words of length n over Z_4 with trace 3 and subtrace 0. %H A074406 Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a> %H A074406 F. Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a> %Y A074406 Cf. A068596, A074403, A074404, A074405, A074407, A074408, A074409, A074410, A074411, A074412, A074413. %K A074406 easy,nonn %O A074406 1,3 %A A074406 _Frank Ruskey_ and Nate Kube, Aug 22 2002 %E A074406 Terms a(15) onward from _Max Alekseyev_, Apr 09 2013