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A022508 Describe previous term from the right (method A - initial term is 4). 2
4, 14, 1411, 211411, 21142112, 122112142112, 122112141112212211, 2122112231141112212211, 21221122311421132221221112, 12312211321321121421132221221112 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Method A = 'frequency' followed by 'digit'-indication.

LINKS

Table of n, a(n) for n=0..9.

EXAMPLE

E.g. the term after 1411 is obtained by saying "two 1's, one 4, one 1", which gives 211411.

MATHEMATICA

A022508[1]:=4; A022508[n_]:=A022508[n]=FromDigits[Flatten[{Length[#], First[#]}&/@Split[Reverse[IntegerDigits[A022508[n-1]]]]]]; Map[A022508, Range[15]] (* Peter J. C. Moses, Apr 22 2013 *)

CROSSREFS

Cf. A022506, A006711, A022482, A022507-A022513.

Sequence in context: A001140 A177363 A138488 * A161741 A186509 A323085

Adjacent sequences:  A022505 A022506 A022507 * A022509 A022510 A022511

KEYWORD

nonn,base,easy,nice

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Erich Friedman.

STATUS

approved

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Last modified April 3 01:39 EDT 2020. Contains 333195 sequences. (Running on oeis4.)