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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 21 |
| 3 | 321 |
| 4 | 4321 |
| 5 | 54321 |
| 6 | 654321 |
| 7 | 7654321 |
| 8 | 87654321 |
| 9 | 987654321 |
| 10 | 987654321 |
| 11 | 10987654321 |
| 12 | 210987654321 |
| 13 | 3210987654321 |
| 14 | 43210987654321 |
| 15 | 543210987654321 |
| 16 | 6543210987654321 |
| 17 | 76543210987654321 |
| 18 | 876543210987654321 |
[0,1,21,321,4321,54321,654321,7654321,87654321, 987654321,987654321,10987654321,210987654321, 3210987654321,43210987654321,543210987654321, 6543210987654321,76543210987654321, 876543210987654321] |