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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 120 |
| 4 | 672 |
| 5 | 8128 |
| 6 | 30240 |
| 7 | 32760 |
| 8 | 33550336 |
| 9 | 459818240 |
| 10 | 1379454720 |
| 11 | 1476304896 |
| 12 | 8589869056 |
| 13 | 31998395520 |
| 14 | 51001180160 |
| 15 | 66433720320 |
| 16 | 137438691328 |
| 17 | 153003540480 |
| 18 | 403031236608 |
| 19 | 30823866178560 |
| 20 | 796928461056000 |
| 21 | 6088728021160320 |
| 22 | 14942123276641920 |
| 23 | 212517062615531520 |
[1,6,120,672,8128,30240,32760,33550336,459818240, 1379454720,1476304896,8589869056,31998395520, 51001180160,66433720320,137438691328,153003540480, 403031236608,30823866178560,796928461056000, 6088728021160320,14942123276641920, 212517062615531520] |