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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | -128 |
| 3 | 704 |
| 4 | -3072 |
| 5 | 11488 |
| 6 | -38400 |
| 7 | 117632 |
| 8 | -335872 |
| 9 | 904784 |
| 10 | -2320128 |
| 11 | 5702208 |
| 12 | -13504512 |
| 13 | 30952544 |
| 14 | -68901888 |
| 15 | 149403264 |
| 16 | -316342272 |
| 17 | 655445792 |
| 18 | -1331327616 |
| 19 | 2655115712 |
| 20 | -5206288384 |
| 21 | 10049485312 |
| 22 | -19115905536 |
| 23 | 35867019904 |
| 24 | -66437873664 |
[16,-128,704,-3072,11488,-38400,117632,-335872, 904784,-2320128,5702208,-13504512,30952544, -68901888,149403264,-316342272,655445792, -1331327616,2655115712,-5206288384,10049485312, -19115905536,35867019904,-66437873664] |