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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 123 |
| 4 | 1021 |
| 5 | 10021 |
| 6 | 100021 |
| 7 | 1000021 |
| 8 | 10000021 |
| 9 | 100000021 |
| 10 | 1000000021 |
| 11 | 10000000021 |
| 12 | 100000000021 |
| 13 | 1000000000021 |
| 14 | 10000000000021 |
| 15 | 100000000000021 |
| 16 | 1000000000000021 |
| 17 | 10000000000000021 |
| 18 | 100000000000000021 |
| 19 | 1000000000000000021 |
| 20 | 10000000000000000021 |
| 21 | 100000000000000000021 |
| 22 | 1000000000000000000021 |
[0,0,123,1021,10021,100021,1000021,10000021, 100000021,1000000021,10000000021,100000000021, 1000000000021,10000000000021,100000000000021, 1000000000000021,10000000000000021, 100000000000000021,1000000000000000021, 10000000000000000021,100000000000000000021, 1000000000000000000021] |