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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 (list; graph; refs; listen; history; text; internal format)
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.

LINKS

Table of n, a(n) for n=0..19.

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

Adjacent sequences:  A215327 A215328 A215329 * A215331 A215332 A215333

KEYWORD

nonn,more

AUTHOR

Joerg Arndt, Aug 08 2012

STATUS

approved

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Last modified November 15 14:08 EST 2018. Contains 317239 sequences. (Running on oeis4.)