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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | -2 |
| 4 | -8 |
| 5 | -24 |
| 6 | -56 |
| 7 | -104 |
| 8 | 512 |
| 9 | 5824 |
| 10 | 54912 |
| 11 | 385408 |
| 12 | 2590336 |
| 13 | 15920256 |
| 14 | 69311488 |
| 15 | 160063744 |
| 16 | -3936710656 |
| 17 | -67251703808 |
| 18 | -914002857984 |
| 19 | -9821117788160 |
| 20 | -81770855727104 |
| 21 | -551206277726208 |
| 22 | 2175764106870784 |
| 23 | 106679023552528384 |
[1,1,0,-2,-8,-24,-56,-104,512,5824,54912,385408, 2590336,15920256,69311488,160063744,-3936710656, -67251703808,-914002857984,-9821117788160, -81770855727104,-551206277726208,2175764106870784, 106679023552528384] |