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A291797 Over the alphabet {1,2} let A=111, B=211; sequence lists words A, B, AA, AB, BA, BB, AAA, AAB, ... 5
111, 211, 111111, 111211, 211111, 211211, 111111111, 111111211, 111211111, 111211211, 211111111, 211111211, 211211111, 211211211, 111111111111, 111111111111, 111111111211, 111111211111, 111111211211, 111211111111, 111211111211 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..21.

Peter R. J. Asveld, On a Post's System of Tag. Bulletin of the EATCS 36 (1988), 96-102. See Table 3.

CROSSREFS

Sequence in context: A245364 A172189 A279777 * A088287 A082946 A082945

Adjacent sequences:  A291794 A291795 A291796 * A291798 A291799 A291800

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Sep 04 2017

STATUS

approved

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Last modified June 25 17:47 EDT 2019. Contains 324353 sequences. (Running on oeis4.)