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 A074408 #22 Jul 22 2025 11:14:04
%S A074408 0,1,2,4,11,32,128,512,1920,6963,24576,87380,317755,1179648,4438966,
%T A074408 16777216,63406080,239541344,905969664,3435973836,13076666409,
%U A074408 49928994816,191126044672,733007751680,2815436626328,10828603699515,41705086880768,160842843834660
%N A074408 Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 2.
%C A074408 Same as the number of 4-ary Lyndon words of length n over Z_4 with trace 3 and subtrace 2.
%H A074408 Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a>
%H A074408 Frank Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a>
%e A074408 a(3;1,2)=2 since the two 4-ary Lyndon words of trace 1, subtrace 2 and length 3 are { 023, 032 }.
%Y A074408 Cf. A068596, A074403, A074404, A074405, A074406, A074407, A074409, A074410, A074411, A074412, A074413.
%K A074408 easy,nonn
%O A074408 1,3
%A A074408 _Frank Ruskey_ and Nate Kube, Aug 22 2002
%E A074408 Terms a(15) onward from _Max Alekseyev_, Apr 09 2013