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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 0 |
| 3 | 24 |
| 4 | -296 |
| 5 | 5910 |
| 6 | -147624 |
| 7 | 4482044 |
| 8 | -160180656 |
| 9 | 6588215370 |
| 10 | -306553312880 |
| 11 | 15921704570112 |
| 12 | -913109351334168 |
| 13 | 57312158437875614 |
| 14 | -3907821040411155672 |
| 15 | 287639624919939481380 |
| 16 | -22731972554599539494624 |
| 17 | 1919809166125424793288978 |
| 18 | -172552913868209944831000416 |
[2,0,24,-296,5910,-147624,4482044,-160180656, 6588215370,-306553312880,15921704570112, -913109351334168,57312158437875614, -3907821040411155672,287639624919939481380, -22731972554599539494624, 1919809166125424793288978, -172552913868209944831000416] |