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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 108 |
| 4 | 32076 |
| 5 | 2147160096 |
| 6 | 9223372004645279520 |
| 7 | 170141183460469231537996491317719562880 |
| 8 | 57896044618658097711785492504343953921871039195927143534211473291570199939840 |
[1,2,6,108,32076,2147160096,9223372004645279520, 170141183460469231537996491317719562880, 57896044618658097711785492504343953921871039195927\ 143534211473291570199939840] |