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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 40 |
| 3 | 184 |
| 4 | 833 |
| 5 | 3396 |
| 6 | 13808 |
| 7 | 55997 |
| 8 | 224172 |
| 9 | 899277 |
| 10 | 3601904 |
| 11 | 14404537 |
| 12 | 57636288 |
| 13 | 230552981 |
| 14 | 922356789 |
| 15 | 3689638640 |
[1,8,40,184,833,3396,13808,55997,224172,899277, 3601904,14404537,57636288,230552981,922356789, 3689638640] |