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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 8 |
| 3 | 96 |
| 4 | 1920 |
| 5 | 53760 |
| 6 | 1935360 |
| 7 | 85155840 |
| 8 | 4428103680 |
| 9 | 265686220800 |
| 10 | 18066663014400 |
| 11 | 1373066389094400 |
| 12 | 115337576683929600 |
| 13 | 10611057054921523200 |
| 14 | 1061105705492152320000 |
| 15 | 114599416193152450560000 |
[0,2,8,96,1920,53760,1935360,85155840,4428103680, 265686220800,18066663014400,1373066389094400, 115337576683929600,10611057054921523200, 1061105705492152320000,114599416193152450560000] |