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A300517 as a simple table

n a(n)
1 1
2 221
3 333221
4 4444333221
5 555554444333221
6 666666555554444333221
7 7777777666666555554444333221
8 888888887777777666666555554444333221
9 999999999888888887777777666666555554444333221
10 10101010101010101010999999999888888887777777666666555554444333221 

[1,221,333221,4444333221,555554444333221,
 666666555554444333221,
 7777777666666555554444333221,
 888888887777777666666555554444333221,
 999999999888888887777777666666555554444333221,
 10101010101010101010999999999888888887777777666666\
 555554444333221]

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Last modified May 19 00:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)