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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 63 |
| 4 | 29471 |
| 5 | 2144945976 |
| 6 | 9223371624669871587 |
| 7 | 170141183460469227599616678821978424151 |
| 8 | 57896044618658097711785492504343953752410420469299789800819363538011879603532 |
[1,1,2,63,29471,2144945976,9223371624669871587, 170141183460469227599616678821978424151, 57896044618658097711785492504343953752410420469299\ 789800819363538011879603532] |