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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -9 |
| 4 | -32 |
| 5 | 225 |
| 6 | 3456 |
| 7 | 2695 |
| 8 | -433152 |
| 9 | -4495743 |
| 10 | 47872000 |
| 11 | 1768142871 |
| 12 | 6703534080 |
| 13 | -597265448351 |
| 14 | -11959736205312 |
| 15 | 126058380654375 |
| 16 | 9454322092343296 |
| 17 | 84694164336894465 |
| 18 | -5776865438988238848 |
| 19 | -192541299662555831753 |
| 20 | 1511905067561779200000 |
| 21 | 243338391925401706938081 |
| 22 | 3972949090873574466519040 |
[1,1,0,-9,-32,225,3456,2695,-433152,-4495743, 47872000,1768142871,6703534080,-597265448351, -11959736205312,126058380654375,9454322092343296, 84694164336894465,-5776865438988238848, -192541299662555831753,1511905067561779200000, 243338391925401706938081, 3972949090873574466519040] |