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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | -16 |
| 3 | 128 |
| 4 | 9984 |
| 5 | -1444608 |
| 6 | 105185280 |
| 7 | 11495516160 |
| 8 | -7997802086400 |
| 9 | 2106956324536320 |
| 10 | 3592879276032000 |
| 11 | -400446184903952302080 |
| 12 | 271017181684548910448640 |
| 13 | -56861458491339484126248960 |
[0,2,-16,128,9984,-1444608,105185280,11495516160, -7997802086400,2106956324536320,3592879276032000, -400446184903952302080,271017181684548910448640, -56861458491339484126248960] |