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| n | a(n) |
|---|---|
| 0 | 5 |
| 1 | 54 |
| 2 | 549 |
| 3 | 5499 |
| 4 | 54999 |
| 5 | 549999 |
| 6 | 5499999 |
| 7 | 54999999 |
| 8 | 549999999 |
| 9 | 5499999999 |
| 10 | 54999999999 |
| 11 | 549999999999 |
| 12 | 5499999999999 |
| 13 | 54999999999999 |
| 14 | 549999999999999 |
| 15 | 5499999999999999 |
| 16 | 54999999999999999 |
| 17 | 549999999999999999 |
| 18 | 5499999999999999999 |
[5,54,549,5499,54999,549999,5499999,54999999, 549999999,5499999999,54999999999,549999999999, 5499999999999,54999999999999,549999999999999, 5499999999999999,54999999999999999, 549999999999999999,5499999999999999999] |