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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | -12 |
| 4 | -56 |
| 5 | 80 |
| 6 | 1056 |
| 7 | 832 |
| 8 | -15232 |
| 9 | -43776 |
| 10 | 156160 |
| 11 | 1012736 |
| 12 | -473088 |
| 13 | -17149952 |
| 14 | -26730496 |
| 15 | 220938240 |
| 16 | 869564416 |
| 17 | -1795883008 |
| 18 | -17504796672 |
| 19 | -6275465216 |
| 20 | 267525816320 |
| 21 | 635459076096 |
| 22 | -3009494908928 |
| 23 | -16186335035392 |
| 24 | 15779248472064 |
| 25 | 290539857510400 |
[0,1,2,-12,-56,80,1056,832,-15232,-43776,156160, 1012736,-473088,-17149952,-26730496,220938240, 869564416,-1795883008,-17504796672,-6275465216, 267525816320,635459076096,-3009494908928, -16186335035392,15779248472064,290539857510400] |