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| n | a(n) |
|---|---|
| 1 | 12 |
| 2 | 280 |
| 3 | 4080 |
| 4 | 64189 |
| 5 | 1012315 |
| 6 | 16031147 |
| 7 | 253594307 |
| 8 | 4003959566 |
| 9 | 63279327977 |
| 10 | 1000139739583 |
| 11 | 15804787030137 |
| 12 | 249762291976009 |
| 13 | 3947048440634688 |
| 14 | 62375786616766976 |
| 15 | 985731805754249812 |
| 16 | 15577646241372914358 |
[12,280,4080,64189,1012315,16031147,253594307, 4003959566,63279327977,1000139739583, 15804787030137,249762291976009,3947048440634688, 62375786616766976,985731805754249812, 15577646241372914358] |