| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 444 |
| 4 | 4 |
| 5 | 40 |
| 6 | 444 |
| 7 | 4004 |
| 8 | 40 |
| 9 | 444444444 |
| 10 | 40 |
| 11 | 44 |
| 12 | 444 |
| 13 | 4004 |
| 14 | 4004 |
| 15 | 4440 |
| 16 | 400 |
| 17 | 44404 |
| 18 | 444444444 |
| 19 | 44004 |
| 20 | 40 |
| 21 | 40404 |
| 22 | 44 |
| 23 | 440404 |
| 24 | 4440 |
| 25 | 400 |
| 26 | 4004 |
| 27 | 4404444444 |
| 28 | 4004 |
| 29 | 4404404 |
| 30 | 4440 |
| 31 | 444044 |
| 32 | 4000 |
| 33 | 444444 |
| 34 | 44404 |
| 35 | 40040 |
| 36 | 444444444 |
| 37 | 444 |
| 38 | 44004 |
| 39 | 40404 |
[4,4,444,4,40,444,4004,40,444444444,40,44,444, 4004,4004,4440,400,44404,444444444,44004,40,40404, 44,440404,4440,400,4004,4404444444,4004,4404404, 4440,444044,4000,444444,44404,40040,444444444,444, 44004,40404] |