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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)
+0
2
1, 1, 2, 21, 32, 331, 433, 4351, 53621, 647221, 7673221, 8883233, 891132333, 8101532334101, 101118423351110001, 141220533351220001001, 17142355335122101100101, 23162558335122102101101001, 30192751033612210211110100201, 3823295114361321021111110020101001 (list; graph; listen)
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Last modified December 16 13:01 EST 2009. Contains 170825 sequences.


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