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A215330
Smooth Lyndon words with 4 colors.
1
1, 4, 3, 8, 18, 47, 108, 268, 638, 1553, 3761, 9189, 22453, 55185, 135894, 335906, 832312, 2068066, 5149845, 12852750, 32138353, 80509495, 202013368, 507669048, 1277586867, 3219366610, 8122275225
OFFSET
0,2
COMMENTS
We call a Lyndon word (x[1],x[2],...,x[n]) smooth if abs(x[k]-x[k-1]) <= 1 for 2<=k<=n.
EXAMPLE
(See A215329).
CROSSREFS
Cf. A215329 (smooth necklaces, 4 colors), A215328 (smooth Lyndon words, 3 colors).
Sequence in context: A198179 A137503 A320263 * A108624 A108623 A248248
KEYWORD
nonn,more
AUTHOR
Joerg Arndt, Aug 08 2012
EXTENSIONS
More terms from Joerg Arndt, Jun 17 2019
STATUS
approved