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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -4 |
| 3 | 350 |
| 4 | -11240 |
| 5 | 1703578 |
| 6 | -193890860 |
| 7 | 49492653366 |
| 8 | -12321392081232 |
| 9 | 4919573673167538 |
| 10 | -2124948350723616724 |
| 11 | 1246509899975408733326 |
| 12 | -820629733751515166342200 |
| 13 | 671843179144303883329974346 |
| 14 | -622270861646882104886119580924 |
[0,2,-4,350,-11240,1703578,-193890860,49492653366, -12321392081232,4919573673167538, -2124948350723616724,1246509899975408733326, -820629733751515166342200, 671843179144303883329974346, -622270861646882104886119580924] |