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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -1 |
| 3 | -8 |
| 4 | 18 |
| 5 | 42 |
| 6 | 15 |
| 7 | -3460 |
| 8 | 16492 |
| 9 | 16890 |
| 10 | 286155 |
| 11 | -12520400 |
| 12 | 99727254 |
| 13 | -271849550 |
| 14 | 6922105827 |
| 15 | -197946213020 |
| 16 | 2348657908440 |
| 17 | -19619328534222 |
| 18 | 396132741200439 |
| 19 | -9735975917400728 |
| 20 | 156971908263615450 |
| 21 | -2248810586848724102 |
| 22 | 48167349073405076823 |
| 23 | -1170896255906195317300 |
[0,2,-1,-8,18,42,15,-3460,16492,16890,286155, -12520400,99727254,-271849550,6922105827, -197946213020,2348657908440,-19619328534222, 396132741200439,-9735975917400728, 156971908263615450,-2248810586848724102, 48167349073405076823,-1170896255906195317300] |