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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 48 |
| 4 | 288 |
| 5 | 1736 |
| 6 | 10366 |
| 7 | 63911 |
| 8 | 435756 |
| 9 | 3703209 |
| 10 | 40131451 |
| 11 | 482893994 |
| 12 | 5700587521 |
| 13 | 63022146850 |
| 14 | 649554554509 |
| 15 | 6315823743218 |
| 16 | 59044525222412 |
[1,8,48,288,1736,10366,63911,435756,3703209, 40131451,482893994,5700587521,63022146850, 649554554509,6315823743218,59044525222412] |