A215330 Smooth Lyndon words with 4 colors.

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

Author

Joerg Arndt, Aug 08 2012

Keywords

• nonn
• more

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.

Examples

			(See A215329).
		

Crossrefs

Cf. A215329 (smooth necklaces, 4 colors), A215328 (smooth Lyndon words, 3 colors).

Extensions

More terms from Joerg Arndt, Jun 17 2019