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%I #13 May 03 2019 07:45:35
%S 0,0,2,4,16,36,128,440,1706,6560,24576,90046,327680,1197824,4438966,
%T 16645120,62914560,238609052,905969664,3442670796,13102206738,
%U 49977704448,191126044672,732649663000,2814062572336,10825960652800,41705086880768,160862475611574
%N Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 1.
%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>
%Y Cf. A068596, A074403, A074404, A074405, A074406, A074407, A074408, A074409, A074410, A074412, A074413.
%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