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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 80 |
| 5 | 2080 |
| 6 | 158080 |
| 7 | 36674560 |
| 8 | 28019363840 |
| 9 | 73410733260800 |
| 10 | 697108323044556800 |
| 11 | 24883978699398499532800 |
| 12 | 3487539382678098506520985600 |
| 13 | 1982680089210029713351206397542400 |
| 14 | 4739557099654791829171791869197156352000 |
[1,2,8,80,2080,158080,36674560,28019363840, 73410733260800,697108323044556800, 24883978699398499532800, 3487539382678098506520985600, 1982680089210029713351206397542400, 4739557099654791829171791869197156352000] |