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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 192 |
| 3 | 3360 |
| 4 | 61440 |
| 5 | 1153152 |
| 6 | 22020096 |
| 7 | 425677824 |
| 8 | 8304721920 |
| 9 | 163176499200 |
| 10 | 3224446697472 |
| 11 | 64012657213440 |
| 12 | 1275708366127104 |
| 13 | 25506581874278400 |
| 14 | 511404848311173120 |
| 15 | 10278423735852072960 |
| 16 | 207016682596362878976 |
| 17 | 4177272328882468945920 |
| 18 | 84430333294202899660800 |
[1,12,192,3360,61440,1153152,22020096,425677824, 8304721920,163176499200,3224446697472, 64012657213440,1275708366127104,25506581874278400, 511404848311173120,10278423735852072960, 207016682596362878976,4177272328882468945920, 84430333294202899660800] |