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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 12 |
| 3 | 216 |
| 4 | 64152 |
| 5 | 4294320192 |
| 6 | 18446744009290559040 |
| 7 | 340282366920938463075992982635439125760 |
| 8 | 115792089237316195423570985008687907843742078391854287068422946583140399879680 |
[2,4,12,216,64152,4294320192,18446744009290559040, 340282366920938463075992982635439125760, 11579208923731619542357098500868790784374207839185\ 4287068422946583140399879680] |