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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -31 |
| 3 | -95 |
| 4 | 2881 |
| 5 | 15041 |
| 6 | -445919 |
| 7 | -3333791 |
| 8 | 96552065 |
| 9 | 950002561 |
| 10 | -26856992159 |
| 11 | -330857811679 |
| 12 | 9122803428289 |
| 13 | 136172203113025 |
| 14 | -3658914023055199 |
| 15 | -64664061017690399 |
| 16 | 1691614670048805121 |
| 17 | 34799613911106289409 |
| 18 | -885438766595443696415 |
[1,1,-31,-95,2881,15041,-445919,-3333791,96552065, 950002561,-26856992159,-330857811679, 9122803428289,136172203113025,-3658914023055199, -64664061017690399,1691614670048805121, 34799613911106289409,-885438766595443696415] |