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A006920 At each step, record how many 1's, 2's, etc. have been seen so far in the sequence.
(Formerly M2126)
2
1, 1, 2, 21, 32, 331, 433, 4351, 53621, 647221, 7673221, 8883233, 891132333, 8101532334101, 101118423351110001, 141220533351220001001, 17142355335122101100101, 23162558335122102101101001, 30192751033612210211110100201, 3823295114361321021111110020101001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

A030717 is the tabular version of this sequence.

Sequence in context: A075715 A071761 A101316 * A089558 A215753 A041049

Adjacent sequences:  A006917 A006918 A006919 * A006921 A006922 A006923

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Jim Propp (propp(AT)math.wisc.edu)

EXTENSIONS

More terms from Franklin T. Adams-Watters, Dec 14 2006

STATUS

approved

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Last modified June 19 12:48 EDT 2013. Contains 226404 sequences.