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A074413
Number of 4-ary Lyndon words of length n over Z_4 with trace 2 and subtrace 3.
12
0, 0, 2, 6, 16, 44, 128, 440, 1706, 6496, 24576, 90004, 327680, 1198336, 4438966, 16645120, 62914560, 238602228, 905969664, 3442672434, 13102206738, 49977802752, 191126044672, 732649663000, 2814062572336, 10825959342080, 41705086880768, 160862475536676
OFFSET
1,3
EXAMPLE
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 }.
KEYWORD
easy,nonn
AUTHOR
Frank Ruskey and Nate Kube, Aug 22 2002
EXTENSIONS
Terms a(16) onward from Max Alekseyev, Apr 09 2013
STATUS
approved