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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 88 |
| 4 | 2176 |
| 5 | 78080 |
| 6 | 4159616 |
| 7 | 307882240 |
| 8 | 29920681984 |
| 9 | 3710767394816 |
| 10 | 571523842998272 |
| 11 | 107010484096565248 |
| 12 | 23940179383147724800 |
| 13 | 6306683724617339961344 |
| 14 | 1932337463823712544620544 |
[1,2,8,88,2176,78080,4159616,307882240, 29920681984,3710767394816,571523842998272, 107010484096565248,23940179383147724800, 6306683724617339961344,1932337463823712544620544] |