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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 0 |
| 3 | 16 |
| 4 | 0 |
| 5 | -56 |
| 6 | 0 |
| 7 | 160 |
| 8 | 0 |
| 9 | -404 |
| 10 | 0 |
| 11 | 944 |
| 12 | 0 |
| 13 | -2072 |
| 14 | 0 |
| 15 | 4320 |
| 16 | 0 |
| 17 | -8648 |
| 18 | 0 |
| 19 | 16720 |
| 20 | 0 |
| 21 | -31360 |
| 22 | 0 |
| 23 | 57312 |
| 24 | 0 |
| 25 | -102364 |
| 26 | 0 |
| 27 | 179104 |
| 28 | 0 |
| 29 | -307672 |
| 30 | 0 |
| 31 | 519808 |
| 32 | 0 |
| 33 | -864960 |
| 34 | 0 |
| 35 | 1419456 |
| 36 | 0 |
| 37 | -2299832 |
| 38 | 0 |
| 39 | 3682400 |
| 40 | 0 |
| 41 | -5831784 |
| 42 | 0 |
| 43 | 9141808 |
| 44 | 0 |
| 45 | -14194200 |
| 46 | 0 |
| 47 | 21842368 |
| 48 | 0 |
[1,-4,0,16,0,-56,0,160,0,-404,0,944,0,-2072,0, 4320,0,-8648,0,16720,0,-31360,0,57312,0,-102364,0, 179104,0,-307672,0,519808,0,-864960,0,1419456,0, -2299832,0,3682400,0,-5831784,0,9141808,0, -14194200,0,21842368,0] |