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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 0 |
| 4 | -16 |
| 5 | -60 |
| 6 | -40 |
| 7 | 336 |
| 8 | -2560 |
| 9 | -20976 |
| 10 | 342688 |
| 11 | 4002944 |
| 12 | -24866048 |
| 13 | -523996096 |
| 14 | 3812202368 |
| 15 | 103065059072 |
| 16 | -777384271872 |
| 17 | -26888473739008 |
| 18 | 196597142376960 |
| 19 | 8734488670474240 |
| 20 | -63053651090673664 |
[0,1,2,0,-16,-60,-40,336,-2560,-20976,342688, 4002944,-24866048,-523996096,3812202368, 103065059072,-777384271872,-26888473739008, 196597142376960,8734488670474240, -63053651090673664] |