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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | 0 |
| 4 | 2 |
| 5 | 8 |
| 6 | -64 |
| 7 | -112 |
| 8 | 2064 |
| 9 | 8192 |
| 10 | -157056 |
| 11 | -599808 |
| 12 | 16072704 |
| 13 | 80010240 |
| 14 | -2484268032 |
| 15 | -13537247232 |
| 16 | 506459129856 |
| 17 | 3160676007936 |
| 18 | -135526008225792 |
| 19 | -929451393220608 |
| 20 | 45507663438741504 |
| 21 | 343173318976733184 |
| 22 | -18834884514478817280 |
| 23 | -154043745649772986368 |
[0,1,-1,0,2,8,-64,-112,2064,8192,-157056,-599808, 16072704,80010240,-2484268032,-13537247232, 506459129856,3160676007936,-135526008225792, -929451393220608,45507663438741504, 343173318976733184,-18834884514478817280, -154043745649772986368] |