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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 264 |
| 3 | 129976320 |
| 4 | 911520057021235200 |
| 5 | 257326999238092967427785160130560 |
| 6 | 6705710151431658873046319662156165939200000000000000 |
| 7 | 32132958735643556926111996291480203406145819659840760945049600000000000000000 |
[2,264,129976320,911520057021235200, 257326999238092967427785160130560, 67057101514316588730463196621561659392000000000000\ 00, 32132958735643556926111996291480203406145819659840\ 760945049600000000000000000] |