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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | -24 |
| 1 | 276 |
| 2 | -2048 |
| 3 | 11202 |
| 4 | -49152 |
| 5 | 184024 |
| 6 | -614400 |
| 7 | 1881471 |
| 8 | -5373952 |
| 9 | 14478180 |
| 10 | -37122048 |
| 11 | 91231550 |
| 12 | -216072192 |
| 13 | 495248952 |
| 14 | -1102430208 |
| 15 | 2390434947 |
| 16 | -5061476352 |
| 17 | 10487167336 |
| 18 | -21301241856 |
| 19 | 42481784514 |
| 20 | -83300614144 |
[1,-24,276,-2048,11202,-49152,184024,-614400, 1881471,-5373952,14478180,-37122048,91231550, -216072192,495248952,-1102430208,2390434947, -5061476352,10487167336,-21301241856,42481784514, -83300614144] |