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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | -4 |
| 3 | 8 |
| 4 | 36 |
| 5 | -144 |
| 6 | 236 |
| 7 | -328 |
| 8 | 580 |
| 9 | -1088 |
| 10 | 1836 |
| 11 | -3096 |
| 12 | 5668 |
| 13 | -10736 |
| 14 | 20668 |
| 15 | -40328 |
[0,-4,8,36,-144,236,-328,580,-1088,1836,-3096, 5668,-10736,20668,-40328] |