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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 9 |
| 5 | 11 |
| 6 | 18 |
| 7 | 54 |
| 8 | 74 |
| 9 | 108 |
| 10 | 135 |
| 11 | 426 |
| 12 | 531 |
| 13 | 585 |
| 14 | 1361 |
| 15 | 3456 |
| 16 | 6771 |
| 17 | 7245 |
| 18 | 7392 |
| 19 | 11025 |
| 20 | 11957 |
| 21 | 21494 |
| 22 | 27063 |
| 23 | 41952 |
| 24 | 68494 |
| 25 | 72516 |
| 26 | 108742 |
| 27 | 128331 |
[1,2,3,9,11,18,54,74,108,135,426,531,585,1361, 3456,6771,7245,7392,11025,11957,21494,27063,41952, 68494,72516,108742,128331] |