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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 405 |
| 4 | 26880 |
| 5 | 2953125 |
| 6 | 484989120 |
| 7 | 111289483305 |
| 8 | 34007836262400 |
| 9 | 13350287284158825 |
| 10 | 6547290750000000000 |
| 11 | 3922838769902739011325 |
| 12 | 2819575386162274605465600 |
| 13 | 2394486245934541921935898125 |
| 14 | 2371947271643716575046318080000 |
| 15 | 2710687260280640086154937744140625 |
| 16 | 3539907755812512418187309922385920000 |
[1,1,12,405,26880,2953125,484989120,111289483305, 34007836262400,13350287284158825, 6547290750000000000,3922838769902739011325, 2819575386162274605465600, 2394486245934541921935898125, 2371947271643716575046318080000, 2710687260280640086154937744140625, 3539907755812512418187309922385920000] |