| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 9 |
| 5 | 20 |
| 6 | 46 |
| 7 | 58 |
| 8 | 64 |
| 9 | 69 |
| 10 | 110 |
| 11 | 158 |
| 12 | 178 |
| 13 | 186 |
| 14 | 268 |
| 15 | 424 |
| 16 | 624 |
| 17 | 641 |
| 18 | 1236 |
| 19 | 1593 |
| 20 | 2264 |
| 21 | 2870 |
| 22 | 5797 |
| 23 | 7518 |
| 24 | 7688 |
| 25 | 9300 |
[1,2,6,9,20,46,58,64,69,110,158,178,186,268,424, 624,641,1236,1593,2264,2870,5797,7518,7688,9300] |