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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 56 |
| 3 | 384 |
| 4 | 2536 |
| 5 | 16512 |
| 6 | 105664 |
| 7 | 669696 |
| 8 | 4201832 |
| 9 | 26183808 |
| 10 | 162073408 |
| 11 | 998129664 |
| 12 | 6117389760 |
| 13 | 37346353152 |
| 14 | 227164816896 |
| 15 | 1377490599936 |
| 16 | 8328848160360 |
[1,8,56,384,2536,16512,105664,669696,4201832, 26183808,162073408,998129664,6117389760, 37346353152,227164816896,1377490599936, 8328848160360] |