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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 48 |
| 5 | 960 |
| 6 | 30720 |
| 7 | 2064384 |
| 8 | 264241152 |
| 9 | 68451041280 |
| 10 | 35046933135360 |
| 11 | 35993612646875136 |
| 12 | 73714918700800278528 |
| 13 | 302157667927362455470080 |
| 14 | 2475275615660953235210895360 |
| 15 | 40562343327224770087344704323584 |
[0,0,6,48,960,30720,2064384,264241152,68451041280, 35046933135360,35993612646875136, 73714918700800278528,302157667927362455470080, 2475275615660953235210895360, 40562343327224770087344704323584] |