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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 135 |
| 4 | 3584 |
| 5 | 131250 |
| 6 | 6158592 |
| 7 | 353299947 |
| 8 | 23991418880 |
| 9 | 1883638417518 |
| 10 | 167960000000000 |
| 11 | 16772331868538246 |
| 12 | 1854655886442627072 |
| 13 | 225005916687384753700 |
| 14 | 29718395534545380311040 |
| 15 | 4245313393689422607421875 |
| 16 | 652233889532678001886494720 |
| 17 | 107247390031799133661006687830 |
[1,1,8,135,3584,131250,6158592,353299947, 23991418880,1883638417518,167960000000000, 16772331868538246,1854655886442627072, 225005916687384753700,29718395534545380311040, 4245313393689422607421875, 652233889532678001886494720, 107247390031799133661006687830] |