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A160265 Each of the number describes the previous number, and is described by the next number. 0
1, 11, 12, 1121, 1321, 123121 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Starting with 1, each of the rest describes the previous number in a "digit + number_of_digits" manner. The odd digits are digits that appeared in the previous term, ordered by the first appearance. The even digits are how many times that digit appeared. In case 10+ of a single digit appears, the number-group in the next term that describes this digit takes up 3+ digits (the "even digit" takes up 2+), and each of the digit is considered a single digit when described by the next term.

LINKS

Table of n, a(n) for n=1..6.

CROSSREFS

A variant of A005150. See Index entries under "Say what you see". - N. J. A. Sloane, May 10 2009

Sequence in context: A087304 A340204 A121808 * A007651 A022481 A156338

Adjacent sequences:  A160262 A160263 A160264 * A160266 A160267 A160268

KEYWORD

nonn,base

AUTHOR

Adrian Lee (prof.adrian.lee(AT)gmail.com), May 07 2009

STATUS

approved

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Last modified May 11 21:35 EDT 2021. Contains 343808 sequences. (Running on oeis4.)