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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 123 |
| 5 | 3024 |
| 6 | 106850 |
| 7 | 5110440 |
| 8 | 317955435 |
| 9 | 24986363648 |
| 10 | 2422868732514 |
| 11 | 284385893015080 |
| 12 | 39758967921029830 |
| 13 | 6530586385172586528 |
| 14 | 1245479442254732687652 |
| 15 | 272988926352496428778928 |
[1,1,1,8,123,3024,106850,5110440,317955435, 24986363648,2422868732514,284385893015080, 39758967921029830,6530586385172586528, 1245479442254732687652,272988926352496428778928] |