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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 54 |
| 3 | 1368 |
| 4 | 40365 |
| 5 | 1299078 |
| 6 | 44223732 |
| 7 | 1565864784 |
| 8 | 57079952046 |
| 9 | 2127818007315 |
| 10 | 80742077597610 |
| 11 | 3108398557803480 |
| 12 | 121107814518484872 |
| 13 | 4766365291226837508 |
| 14 | 189209375036491438800 |
| 15 | 7567095678024459993120 |
| 16 | 304603864960375133224533 |
| 17 | 12331716699093681951702810 |
[1,3,54,1368,40365,1299078,44223732,1565864784, 57079952046,2127818007315,80742077597610, 3108398557803480,121107814518484872, 4766365291226837508,189209375036491438800, 7567095678024459993120,304603864960375133224533, 12331716699093681951702810] |