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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 27 |
| 4 | 2025 |
| 5 | 566190 |
| 6 | 625831920 |
| 7 | 2774192113350 |
| 8 | 49208948146347570 |
| 9 | 3472093007861482740960 |
| 10 | 971461407155771477392032600 |
| 11 | 1076446082528185671934674675023160 |
| 12 | 4723701978908086606944984284949329285400 |
| 13 | 82155133922723780601138029235949809990647219040 |
[1,1,3,27,2025,566190,625831920,2774192113350, 49208948146347570,3472093007861482740960, 971461407155771477392032600, 1076446082528185671934674675023160, 4723701978908086606944984284949329285400, 82155133922723780601138029235949809990647219040] |