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A074438
Number of 6-ary Lyndon words of length n with trace 2 and subtrace 4 over Z_6.
21
0, 0, 1, 2, 25, 214, 1296, 6552, 33048, 169987, 894829, 4881168, 27433728, 155483424, 877515379, 4933761408, 27757515151, 156728297088, 889181991936, 5068079700940, 28988793435209, 166191833516125, 954256949236825, 5486915505475584, 31596861676172076
OFFSET
1,4
COMMENTS
Same as the number of 6-ary Lyndon words of length n with trace 4 and subtrace 4 over Z_6.
KEYWORD
easy,nonn
AUTHOR
Frank Ruskey and Nate Kube, Aug 23 2002
EXTENSIONS
Terms a(11) onwards from Max Alekseyev, Feb 20 2010
STATUS
approved