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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | -3 |
| 4 | 0 |
| 5 | -23 |
| 6 | 90 |
| 7 | -721 |
| 8 | 3864 |
| 9 | -47879 |
| 10 | 326214 |
| 11 | -4585141 |
| 12 | 40991676 |
| 13 | -647541971 |
| 14 | 7059334282 |
| 15 | -125142649633 |
| 16 | 1612242903824 |
| 17 | -31683946165871 |
| 18 | 471247352116174 |
| 19 | -10177278274781101 |
| 20 | 171640057469660548 |
[1,0,0,-3,0,-23,90,-721,3864,-47879,326214, -4585141,40991676,-647541971,7059334282, -125142649633,1612242903824,-31683946165871, 471247352116174,-10177278274781101, 171640057469660548] |