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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 9 |
| 2 | 36 |
| 3 | 1080 |
| 4 | 544320 |
| 5 | 5443200 |
| 6 | 102643200 |
| 7 | 392302310400 |
| 8 | 31384184832000 |
| 9 | 1371937222656000 |
| 10 | 10948059036794880000 |
| 11 | 1686001091666411520000 |
| 12 | 10227171457141309440000 |
| 13 | 16333304175627528241152000000 |
| 14 | 457332516917570790752256000000 |
| 15 | 56839898531183798279208960000000 |
[3,9,36,1080,544320,5443200,102643200, 392302310400,31384184832000,1371937222656000, 10948059036794880000,1686001091666411520000, 10227171457141309440000, 16333304175627528241152000000, 457332516917570790752256000000, 56839898531183798279208960000000] |