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| n | a(n) |
|---|---|
| 0 | 12 |
| 1 | 120 |
| 2 | 1080 |
| 3 | 9180 |
| 4 | 75168 |
| 5 | 599616 |
| 6 | 4691520 |
| 7 | 36164880 |
| 8 | 275503680 |
| 9 | 2078711424 |
| 10 | 15559682688 |
| 11 | 115688917440 |
| 12 | 855249269760 |
| 13 | 6291326453760 |
| 14 | 46080184338432 |
| 15 | 336227628720384 |
| 16 | 2445042642140160 |
| 17 | 17726787591690240 |
| 18 | 128173151784867840 |
| 19 | 924487654349822976 |
[12,120,1080,9180,75168,599616,4691520,36164880, 275503680,2078711424,15559682688,115688917440, 855249269760,6291326453760,46080184338432, 336227628720384,2445042642140160, 17726787591690240,128173151784867840, 924487654349822976] |