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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 7 |
| 5 | 8 |
| 6 | 9 |
| 7 | 10 |
| 8 | 29 |
| 9 | 75 |
| 10 | 162 |
| 11 | 270 |
| 12 | 272 |
| 13 | 353 |
| 14 | 720 |
| 15 | 1795 |
| 16 | 3732 |
| 17 | 4768 |
| 18 | 9315 |
| 19 | 12220 |
| 20 | 41531 |
[2,3,4,7,8,9,10,29,75,162,270,272,353,720,1795, 3732,4768,9315,12220,41531] |