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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 5 |
| 3 | 9 |
| 4 | 20 |
| 5 | 21 |
| 6 | 23 |
| 7 | 39 |
| 8 | 45 |
| 9 | 63 |
| 10 | 89 |
| 11 | 94 |
| 12 | 826 |
| 13 | 994 |
| 14 | 1054 |
| 15 | 2886 |
| 16 | 4829 |
| 17 | 5880 |
| 18 | 7928 |
| 19 | 17544 |
| 20 | 47277 |
| 21 | 93226 |
| 22 | 127413 |
[4,5,9,20,21,23,39,45,63,89,94,826,994,1054,2886, 4829,5880,7928,17544,47277,93226,127413] |