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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | -2 |
| 3 | 2 |
| 4 | 28 |
| 5 | 44 |
| 6 | -464 |
| 7 | -3088 |
| 8 | 1408 |
| 9 | 135872 |
| 10 | 726976 |
| 11 | -2959936 |
| 12 | -67261952 |
| 13 | -293413888 |
| 14 | 3054389248 |
| 15 | 52458520064 |
| 16 | 178569842176 |
| 17 | -3909868400128 |
| 18 | -60465254054912 |
| 19 | -149165881689088 |
| 20 | 6569005278939136 |
| 21 | 98054837101881344 |
| 22 | 158559568611401728 |
| 23 | -14356527387138039808 |
[1,-1,-2,2,28,44,-464,-3088,1408,135872,726976, -2959936,-67261952,-293413888,3054389248, 52458520064,178569842176,-3909868400128, -60465254054912,-149165881689088,6569005278939136, 98054837101881344,158559568611401728, -14356527387138039808] |