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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 1779148800 |
| 3 | 148953184174080000 |
| 4 | 126983900296423931904000000 |
| 5 | 614812159599342234168301977600000000 |
| 6 | 11942354952042770431904585727413846016000000000 |
[1,720,1779148800,148953184174080000, 126983900296423931904000000, 614812159599342234168301977600000000, 11942354952042770431904585727413846016000000000] |