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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 378 |
| 4 | 2798336 |
| 5 | 3973658465625 |
| 6 | 1842282678468471349824 |
| 7 | 433296503176904197061300041939288 |
| 8 | 74235003800935257803650942510752495927455127552 |
[1,4,378,2798336,3973658465625, 1842282678468471349824, 433296503176904197061300041939288, 74235003800935257803650942510752495927455127552] |