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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 25 |
| 4 | 67 |
| 5 | 177 |
| 6 | 465 |
| 7 | 1219 |
| 8 | 3193 |
| 9 | 8361 |
| 10 | 21891 |
| 11 | 57313 |
| 12 | 150049 |
| 13 | 392835 |
| 14 | 1028457 |
[1,3,9,25,67,177,465,1219,3193,8361,21891,57313, 150049,392835,1028457] |