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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | -2 |
| 3 | -14 |
| 4 | -94 |
| 5 | -288 |
| 6 | -530 |
| 7 | -842 |
| 8 | -3884 |
| 9 | -25216 |
| 10 | -116026 |
| 11 | -342224 |
| 12 | -522626 |
| 13 | -966578 |
| 14 | -7424752 |
| 15 | -29445104 |
| 16 | -97617938 |
| 17 | -271676470 |
| 18 | -618117940 |
| 19 | -810056106 |
[1,0,-2,-14,-94,-288,-530,-842,-3884,-25216, -116026,-342224,-522626,-966578,-7424752, -29445104,-97617938,-271676470,-618117940, -810056106] |