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A018238 formatted as a simple table:

n a(n)
1 1
2 21
3 3121
4 41213121
5 5121312141213121
6 61213121412131215121312141213121
7 7121312141213121512131214121312161213121412131215121312141213121 

[1,21,3121,41213121,5121312141213121,
 61213121412131215121312141213121,
 7121312141213121512131214121312161213121412131215121312141213121]

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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