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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 23 |
| 4 | 43 |
| 5 | 147 |
| 6 | 439 |
| 7 | 1077 |
| 8 | 3005 |
| 9 | 8707 |
| 10 | 23625 |
| 11 | 64333 |
| 12 | 181321 |
| 13 | 509237 |
| 14 | 1397553 |
| 15 | 3922583 |
| 16 | 11252577 |
| 17 | 31296857 |
| 18 | 88869587 |
| 19 | 262342415 |
| 20 | 745005339 |
| 21 | 2165854075 |
| 22 | 6666351495 |
| 23 | 19567488007 |
| 24 | 58799922721 |
| 25 | 190395211135 |
| 26 | 583866245179 |
[1,9,23,43,147,439,1077,3005,8707,23625,64333, 181321,509237,1397553,3922583,11252577,31296857, 88869587,262342415,745005339,2165854075, 6666351495,19567488007,58799922721,190395211135, 583866245179] |