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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | -686 |
| 3 | -12780 |
| 4 | 1409196 |
| 5 | 45363816 |
| 6 | -4815014664 |
| 7 | -225406138896 |
| 8 | 22982647278480 |
| 9 | 1439841741934176 |
| 10 | -140702191563957984 |
| 11 | -11239870526148498624 |
| 12 | 1050017582244063317184 |
| 13 | 103682343732014971981440 |
| 14 | -9233370964550688463200384 |
| 15 | -1103421356230511467567597824 |
[1,6,-686,-12780,1409196,45363816,-4815014664, -225406138896,22982647278480,1439841741934176, -140702191563957984,-11239870526148498624, 1050017582244063317184,103682343732014971981440, -9233370964550688463200384, -1103421356230511467567597824] |