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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 864 |
| 4 | 69120 |
| 5 | 10368000 |
| 6 | 2612736000 |
| 7 | 1024192512000 |
| 8 | 589934886912000 |
| 9 | 477847258398720000 |
| 10 | 525631984238592000000 |
| 11 | 763217641114435584000000 |
| 12 | 1428743424166223413248000000 |
| 13 | 3380406941577284595744768000000 |
[1,2,24,864,69120,10368000,2612736000, 1024192512000,589934886912000,477847258398720000, 525631984238592000000,763217641114435584000000, 1428743424166223413248000000, 3380406941577284595744768000000] |