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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | -4 |
| 5 | 0 |
| 6 | 4 |
| 7 | 0 |
| 8 | -64 |
| 9 | 0 |
| 10 | -320 |
| 11 | 0 |
| 12 | 384 |
| 13 | 0 |
| 14 | -7680 |
| 15 | 0 |
| 16 | -26880 |
| 17 | 0 |
| 18 | -161280 |
| 19 | 0 |
| 20 | 195840 |
| 21 | 0 |
| 22 | -3096576 |
| 23 | 0 |
| 24 | -10321920 |
| 25 | 0 |
| 26 | -43352064 |
| 27 | 0 |
| 28 | -263208960 |
| 29 | 0 |
| 30 | 319979520 |
| 31 | 0 |
| 32 | -3096576000 |
| 33 | 0 |
| 34 | -10218700800 |
| 35 | 0 |
| 36 | -40874803200 |
| 37 | 0 |
| 38 | -173717913600 |
| 39 | 0 |
| 40 | -1055932416000 |
| 41 | 0 |
| 42 | 1283840409600 |
[0,1,0,-4,0,4,0,-64,0,-320,0,384,0,-7680,0,-26880, 0,-161280,0,195840,0,-3096576,0,-10321920,0, -43352064,0,-263208960,0,319979520,0,-3096576000, 0,-10218700800,0,-40874803200,0,-173717913600,0, -1055932416000,0,1283840409600] |