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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | -20 |
| 4 | -24 |
| 5 | -56 |
| 6 | 144 |
| 7 | 160 |
| 8 | 352 |
| 9 | -832 |
| 10 | -896 |
| 11 | -1920 |
| 12 | 4352 |
| 13 | 4608 |
| 14 | 9728 |
| 15 | -21504 |
| 16 | -22528 |
| 17 | -47104 |
| 18 | 102400 |
| 19 | 106496 |
| 20 | 221184 |
| 21 | -475136 |
| 22 | -491520 |
| 23 | -1015808 |
| 24 | 2162688 |
| 25 | 2228224 |
| 26 | 4587520 |
| 27 | -9699328 |
| 28 | -9961472 |
| 29 | -20447232 |
| 30 | 42991616 |
| 31 | 44040192 |
| 32 | 90177536 |
[1,2,6,-20,-24,-56,144,160,352,-832,-896,-1920, 4352,4608,9728,-21504,-22528,-47104,102400,106496, 221184,-475136,-491520,-1015808,2162688,2228224, 4587520,-9699328,-9961472,-20447232,42991616, 44040192,90177536] |