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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 1680 |
| 3 | 665280 |
| 4 | 518918400 |
| 5 | 670442572800 |
| 6 | 1295295050649600 |
| 7 | 3497296636753920000 |
| 8 | 12576278705767096320000 |
| 9 | 58102407620643984998400000 |
| 10 | 335367096786357081410764800000 |
| 11 | 2365008766537390138108713369600000 |
| 12 | 20007974164906320568399715106816000000 |
[1,12,1680,665280,518918400,670442572800, 1295295050649600,3497296636753920000, 12576278705767096320000, 58102407620643984998400000, 335367096786357081410764800000, 2365008766537390138108713369600000, 20007974164906320568399715106816000000] |