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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | -400 |
| 4 | -54016 |
| 5 | -6545408 |
| 6 | -886739968 |
| 7 | -130488590336 |
| 8 | -17561155108864 |
| 9 | -157860190420992 |
| 10 | 1926815267611213824 |
| 11 | 1659729586864045162496 |
| 12 | 1201487932870410723393536 |
| 13 | 858251595734608746586832896 |
[1,2,8,-400,-54016,-6545408,-886739968, -130488590336,-17561155108864,-157860190420992, 1926815267611213824,1659729586864045162496, 1201487932870410723393536, 858251595734608746586832896] |