OFFSET
1,4
COMMENTS
Let x = RootOf( z^2+z+1 ) and y = 1+x. Also the number of 4-ary Lyndon words of length n over GF(4) with trace 0 and subtrace x. Also the number of 4-ary Lyndon words of length n over GF(4) with trace 0 and subtrace y.
LINKS
EXAMPLE
a(4;0,1)=2 since the two 4-ary Lyndon words of trace 0, subtrace 1 and length 4 are { 0011, 11xx }, where x = RootOf( z^2+z+1 ).
CROSSREFS
KEYWORD
nonn
AUTHOR
Frank Ruskey and Nate Kube, Aug 23 2002
EXTENSIONS
Terms a(16) and beyond from Andrey Zabolotskiy, Jul 21 2021
STATUS
approved