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A165402 as a simple table

n a(n)
1 1
2 21
3 221
4 2221
5 22221
6 222221
7 2222221
8 22222221
9 222222221
10 2222222221
11 22222222221
12 222222222221
13 2222222222221
14 22222222222221
15 222222222222221
16 2222222222222221
17 22222222222222221
18 222222222222222221

[1,21,221,2221,22221,222221,2222221,22222221,
 222222221,2222222221,22222222221,222222222221,
 2222222222221,22222222222221,222222222222221,
 2222222222222221,22222222222222221,
 222222222222222221]

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)