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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 9 |
| 3 | 54 |
| 4 | 4 |
| 5 | 264 |
| 6 | 308 |
| 7 | 7854 |
| 8 | 374 |
| 9 | 1564 |
| 10 | 11339 |
| 11 | 362848 |
| 12 | 127541072 |
| 13 | 1307295988 |
| 14 | 2614591976 |
| 15 | 42742894912 |
| 16 | 1132686715168 |
| 17 | 4608863185856 |
| 18 | 71437379380768 |
| 19 | 162734350229389504 |
| 20 | 46216555465146619136 |
| 21 | 427503138052606227008 |
| 22 | 270181983249247135469056 |
| 23 | 64347502466822129824768 |
[6,9,54,4,264,308,7854,374,1564,11339,362848, 127541072,1307295988,2614591976,42742894912, 1132686715168,4608863185856,71437379380768, 162734350229389504,46216555465146619136, 427503138052606227008,270181983249247135469056, 64347502466822129824768] |