OFFSET
1,3
COMMENTS
Same as number of Lyndon words of length n over Z_5 with trace 2 and subtrace 0; trace 3 and subtrace 0; trace 4 and subtrace 0. Same as number of Lyndon words of length n over GF(5) with trace 1 and subtrace 0; trace 2 and subtrace 0; trace 3 and subtrace 0; trace 4 and subtrace 0.
LINKS
CROSSREFS
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