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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 60 |
| 3 | 6720 |
| 4 | 1663200 |
| 5 | 726485760 |
| 6 | 494010316800 |
| 7 | 482718652416000 |
| 8 | 641171050071552000 |
| 9 | 1111363153457356800000 |
| 10 | 2436552577639909048320000 |
| 11 | 6591982246414881207091200000 |
| 12 | 21572261901392698750205952000000 |
| 13 | 83992431415453295380032651264000000 |
| 14 | 383725422380885198036206312488960000000 |
[2,60,6720,1663200,726485760,494010316800, 482718652416000,641171050071552000, 1111363153457356800000,2436552577639909048320000, 6591982246414881207091200000, 21572261901392698750205952000000, 83992431415453295380032651264000000, 383725422380885198036206312488960000000] |