A006920 At each step, record how many 1's, 2's, etc. have been seen so far in the sequence.

1, 1, 2, 21, 32, 331, 433, 4351, 53621, 647221, 7673221, 8883233, 891132333, 8101532334101, 101118423351110001, 141220533351220001001, 17142355335122101100101, 23162558335122102101101001, 30192751033612210211110100201, 3823295114361321021111110020101001

Offset: 1

Author

N. J. A. Sloane, James Propp

Keywords

• nonn
• base

References

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

Crossrefs

A333867 is the tabular version of this sequence.

Extensions

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