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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -64 |
| 3 | -1836 |
| 4 | 4096 |
| 5 | 3990 |
| 6 | 117504 |
| 7 | -433432 |
| 8 | -262144 |
| 9 | 1776573 |
| 10 | -255360 |
| 11 | 1619772 |
| 12 | -7520256 |
| 13 | -10878466 |
| 14 | 27739648 |
| 15 | -7325640 |
| 16 | 16777216 |
| 17 | 60569298 |
| 18 | -113700672 |
| 19 | -243131740 |
| 20 | 16343040 |
| 21 | 795781152 |
| 22 | -103665408 |
| 23 | -606096456 |
| 24 | 481296384 |
| 25 | -1204783025 |
| 26 | 696221824 |
| 27 | -334611000 |
[1,-64,-1836,4096,3990,117504,-433432,-262144, 1776573,-255360,1619772,-7520256,-10878466, 27739648,-7325640,16777216,60569298,-113700672, -243131740,16343040,795781152,-103665408, -606096456,481296384,-1204783025,696221824, -334611000] |