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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -31 |
| 2 | 434 |
| 3 | -3565 |
| 4 | 18445 |
| 5 | -57505 |
| 6 | 70091 |
| 7 | 227447 |
| 8 | -1241550 |
| 9 | 2102730 |
| 10 | 1139498 |
| 11 | -11000164 |
| 12 | 15185009 |
| 13 | 8060465 |
| 14 | -39266925 |
| 15 | 11975548 |
| 16 | 33735905 |
| 17 | 79961555 |
| 18 | -212042635 |
| 19 | -176681400 |
| 20 | 762467041 |
| 21 | -231771190 |
| 22 | -762218948 |
| 23 | -59474275 |
| 24 | 687626655 |
| 25 | 2193123086 |
| 26 | -3317871844 |
[1,-31,434,-3565,18445,-57505,70091,227447, -1241550,2102730,1139498,-11000164,15185009, 8060465,-39266925,11975548,33735905,79961555, -212042635,-176681400,762467041,-231771190, -762218948,-59474275,687626655,2193123086, -3317871844] |