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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 96 |
| 4 | 2240 |
| 5 | 80960 |
| 6 | 4021248 |
| 7 | 255704064 |
| 8 | 19878918144 |
| 9 | 1829788646400 |
| 10 | 194788537180160 |
| 11 | 23556611967336448 |
| 12 | 3191162612827078656 |
| 13 | 478807179615908462592 |
| 14 | 78833945248222913495040 |
| 15 | 14133035289273287214366720 |
| 16 | 2740751307013005651817267200 |
[1,1,8,96,2240,80960,4021248,255704064, 19878918144,1829788646400,194788537180160, 23556611967336448,3191162612827078656, 478807179615908462592,78833945248222913495040, 14133035289273287214366720, 2740751307013005651817267200] |