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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 64 |
| 4 | 4382 |
| 5 | 1357136 |
| 6 | 1597653852 |
| 7 | 8389021518585 |
| 8 | 164828345435877580 |
| 9 | 14256525628649472111712 |
| 10 | 4602970880920727147946847283 |
| 11 | 6484132480933772335644792339409450 |
| 12 | 34112054985056318746734374876035089268523 |
[1,1,4,64,4382,1357136,1597653852,8389021518585, 164828345435877580,14256525628649472111712, 4602970880920727147946847283, 6484132480933772335644792339409450, 34112054985056318746734374876035089268523] |