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%I #14 May 03 2019 07:44:59
%S 0,0,2,6,16,44,128,440,1706,6496,24576,90004,327680,1198336,4438966,
%T 16645120,62914560,238602228,905969664,3442672434,13102206738,
%U 49977802752,191126044672,732649663000,2814062572336,10825959342080,41705086880768,160862475536676
%N Number of 4-ary Lyndon words of length n over Z_4 with trace 2 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;2,3)=6 since the six 4-ary Lyndon words of trace 2, subtrace 3 and length 4 are { 0123, 0132, 0213, 0231, 0312, 0321 }.
%Y Cf. A068596, A074403, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074411, A074412.
%K easy,nonn
%O 1,3
%A _Frank Ruskey_ and Nate Kube, Aug 22 2002
%E Terms a(16) onward from _Max Alekseyev_, Apr 09 2013
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