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A074434
Number of 6-ary Lyndon words of length n with trace 2 and subtrace 0 over Z_6.
21
1, 1, 1, 4, 36, 214, 1157, 6312, 33048, 167928, 883872, 4881168, 27546779, 155696585, 877515379, 4936018176, 27770211072, 156728297088, 889046473445, 5067822213734, 28988793435209, 166189019079168, 954240788994048, 5486915505475584, 31597040041716690
OFFSET
1,4
COMMENTS
Same as the number of 6-ary Lyndon words of length n with trace 4 and subtrace 0 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