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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 120 |
| 5 | 1984 |
| 6 | 64512 |
| 7 | 4161536 |
| 8 | 534773760 |
| 9 | 137170518016 |
| 10 | 70300024700928 |
| 11 | 72022409665839104 |
| 12 | 147537923792657448960 |
| 13 | 604389122831019749146624 |
| 14 | 4951457925686617442302820352 |
[0,1,3,14,120,1984,64512,4161536,534773760, 137170518016,70300024700928,72022409665839104, 147537923792657448960,604389122831019749146624, 4951457925686617442302820352] |