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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 88 |
| 5 | 888 |
| 6 | 222222 |
| 7 | 444444 |
| 8 | 888888 |
| 9 | 444444444444 |
| 10 | 888888888888 |
| 11 | 444444444444444444 |
| 12 | 888888888888888888 |
| 13 | 888888888888888888888888 |
| 14 | 222222222222222222222222222222 |
| 15 | 444444444444444444444444444444 |
| 16 | 888888888888888888888888888888 |
[2,4,8,88,888,222222,444444,888888,444444444444, 888888888888,444444444444444444, 888888888888888888,888888888888888888888888, 222222222222222222222222222222, 444444444444444444444444444444, 888888888888888888888888888888] |