A317199 - OEIS

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A317199

Bo Tan et al.'s string E_n, defined by A_n = A103269(n) = D_{n-1}E_n = A317197(n-1)E_n for n >= 2, with E_1 = 12.

2

12, 213, 3121, 121312, 2131211213

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

OFFSET

1,1

COMMENTS

See A317200 for length of E_n.

LINKS

Table of n, a(n) for n=1..5.

Bo Tan and Zhi-Ying Wen, Some properties of the Tribonacci sequence, European Journal of Combinatorics, 28 (2007) 1703-1719. See E_n, p. 1706.

EXAMPLE

A_4 = 1213121121312, D_3 = 1213121, so E_4 = 121312.

CROSSREFS

Cf. A103269, A317197, A317200.

See A317201 for the reversals of these words.

Sequence in context: A266910 A296681 A231260 * A281253 A184711 A262739

Adjacent sequences: A317196 A317197 A317198 * A317200 A317201 A317202

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Aug 05 2018

STATUS

approved