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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 12 |
| 2 | 216 |
| 3 | 55728 |
| 4 | 3652301664 |
| 5 | 15686516209310983872 |
| 6 | 289365149921256212111714425927549504896 |
| 7 | 98465858119637274097902770931519409290135390781788892125023848289699334298368 |
[2,12,216,55728,3652301664,15686516209310983872, 289365149921256212111714425927549504896, 98465858119637274097902770931519409290135390781788\ 892125023848289699334298368] |