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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 84 |
| 3 | 10800 |
| 4 | 2857680 |
| 5 | 1285956000 |
| 6 | 880599202560 |
| 7 | 853262368358400 |
| 8 | 1111400775560275200 |
| 9 | 1873276460474747328000 |
| 10 | 3967400888465895264384000 |
| 11 | 10313998054713896966296473600 |
| 12 | 32291970618091110826769565696000 |
| 13 | 119851615755915509174015455948800000 |
[1,2,84,10800,2857680,1285956000,880599202560, 853262368358400,1111400775560275200, 1873276460474747328000,3967400888465895264384000, 10313998054713896966296473600, 32291970618091110826769565696000, 119851615755915509174015455948800000] |