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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 24 |
| 3 | 716 |
| 4 | 83072 |
| 5 | 39087872 |
| 6 | 75401303680 |
| 7 | 594443022065664 |
| 8 | 19031019101108305920 |
| 9 | 2460683831564819120390144 |
| 10 | 1280084328364612961085149413376 |
| 11 | 2672769650751366373008246767117336576 |
| 12 | 22366167127368888262542197147193185822310400 |
| 13 | 749477178086404731802603163228930825036318134763520 |
[1,3,24,716,83072,39087872,75401303680, 594443022065664,19031019101108305920, 2460683831564819120390144, 1280084328364612961085149413376, 2672769650751366373008246767117336576, 22366167127368888262542197147193185822310400, 74947717808640473180260316322893082503631813476352\ 0] |