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] |