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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 256 |
| 3 | 589824 |
| 4 | 86973087744 |
| 5 | 1282470362637926400 |
| 6 | 2723154477021188283432960000 |
| 7 | 1133321924829207204666583887642624000000 |
| 8 | 120746421332702772771144114237731253721340313600000000 |
[1,4,256,589824,86973087744,1282470362637926400, 2723154477021188283432960000, 1133321924829207204666583887642624000000, 12074642133270277277114411423773125372134031360000\ 0000] |