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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 81 |
| 3 | 281 |
| 4 | 953 |
| 5 | 3559 |
| 6 | 14022 |
| 7 | 55727 |
| 8 | 218945 |
| 9 | 863315 |
| 10 | 3440917 |
| 11 | 13790826 |
| 12 | 55318042 |
| 13 | 222174413 |
| 14 | 894490623 |
| 15 | 3609079051 |
| 16 | 14580970526 |
| 17 | 58964739319 |
| 18 | 238673570964 |
| 19 | 966918646489 |
| 20 | 3919864249187 |
| 21 | 15899457324900 |
| 22 | 64518777918726 |
[8,81,281,953,3559,14022,55727,218945,863315, 3440917,13790826,55318042,222174413,894490623, 3609079051,14580970526,58964739319,238673570964, 966918646489,3919864249187,15899457324900, 64518777918726] |