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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | -706 |
| 3 | -8600 |
| 4 | 1494796 |
| 5 | 30815984 |
| 6 | -5272949624 |
| 7 | -154586641184 |
| 8 | 26031140834960 |
| 9 | 997017002818624 |
| 10 | -165162285134295584 |
| 11 | -7859111900887647616 |
| 12 | 1280282420933024937664 |
| 13 | 73212475193022678695680 |
| 14 | -11723880902105281350131584 |
| 15 | -786927222859494361656459776 |
[1,4,-706,-8600,1494796,30815984,-5272949624, -154586641184,26031140834960,997017002818624, -165162285134295584,-7859111900887647616, 1280282420933024937664,73212475193022678695680, -11723880902105281350131584, -786927222859494361656459776] |