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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -16 |
| 4 | -2048 |
| 5 | 1638400 |
| 6 | 7247757312 |
| 7 | -164995463643136 |
| 8 | -18446744073709551616 |
| 9 | 9803356117276277820358656 |
| 10 | 24178516392292583494123520000000 |
| 11 | -271732164163901599116133024293512544256 |
| 12 | -13717048991958695477963985711266803110069141504 |
| 13 | 3074347100178259797134292590832254504315406543889629184 |
[1,1,-16,-2048,1638400,7247757312, -164995463643136,-18446744073709551616, 9803356117276277820358656, 24178516392292583494123520000000, -271732164163901599116133024293512544256, -13717048991958695477963985711266803110069141504, 30743471001782597971342925908322545043154065438896\ 29184] |