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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 208 |
| 3 | 399480 |
| 4 | 10481104587335216 |
| 5 | 123992391755346585462944 |
| 6 | 81988033818127290961528376002383682011136 |
| 7 | 4480981113642949878240780781141254929604041319907336 |
[4,208,399480,10481104587335216, 123992391755346585462944, 81988033818127290961528376002383682011136, 44809811136429498782407807811412549296040413199073\ 36] |