%I #13 May 03 2019 07:46:09

%S 0,0,1,4,16,53,160,512,1706,6144,23133,87380,327680,1217097,4508328,

%T 16777216,62914560,237677216,902444517,3435973836,13102206738,

%U 50026607709,191312691200,733007751680,2814062572336,10823317585920,41694907460224,160842843834660

%N Number of 4-ary Lyndon words of length n over Z_4 with trace 1 and subtrace 3.

%C Same as the number of 4-ary Lyndon words of length n over Z_4 with trace 3 and subtrace 3.

%H Max Alekseyev, <a href="http://home.gwu.edu/~maxal/gpscripts/">PARI/GP scripts for miscellaneous math problems</a>

%H F. Ruskey, <a href="http://combos.org/TSlyndonZ4">4-ary Lyndon words with given trace and subtrace</a>

%e a(4;3,3)=4 since the four 4-ary Lyndon words of trace 3, subtrace 3 and length 4 are { 0111, 0133, 0313, 0331 }.

%Y Cf. A068596, A074403, A074404, A074405, A074406, A074407, A074408, A074410, A074411, A074412, A074413.

%K easy,nonn

%O 1,4

%A _Frank Ruskey_ and Nate Kube, Aug 22 2002

%E Terms a(16) onward from _Max Alekseyev_, Apr 09 2013