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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 123 |
| 4 | 12345 |
| 5 | 123456 |
| 6 | 123456789 |
| 7 | 12345678910 |
| 8 | 123456789101112 |
| 9 | 123456789101112131415 |
| 10 | 123456789101112131415161718 |
| 11 | 1234567891011121314151617181920 |
| 12 | 12345678910111213141516171819202122232425 |
[1,12,123,12345,123456,123456789,12345678910, 123456789101112,123456789101112131415, 123456789101112131415161718, 1234567891011121314151617181920, 12345678910111213141516171819202122232425] |