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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 120 |
| 3 | 32640 |
| 4 | 2147450880 |
| 5 | 9223372034707292160 |
| 6 | 170141183460469231722463931679029329920 |
| 7 | 57896044618658097711785492504343953926464851149359812787997104700240680714240 |
[1,6,120,32640,2147450880,9223372034707292160, 170141183460469231722463931679029329920, 57896044618658097711785492504343953926464851149359\ 812787997104700240680714240] |