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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -4 |
| 2 | 0 |
| 3 | 12 |
| 4 | 108 |
| 5 | 1104 |
| 6 | 14136 |
| 7 | 225768 |
| 8 | 4386168 |
| 9 | 100885248 |
| 10 | 2683789344 |
| 11 | 81047258208 |
| 12 | 2737919298528 |
| 13 | 102266990392896 |
| 14 | 4184016413001408 |
| 15 | 186047367206499072 |
| 16 | 8933002185371731200 |
| 17 | 460580247564830138880 |
| 18 | 25378595790818821816320 |
| 19 | 1488230641037882346324480 |
[1,-4,0,12,108,1104,14136,225768,4386168, 100885248,2683789344,81047258208,2737919298528, 102266990392896,4184016413001408, 186047367206499072,8933002185371731200, 460580247564830138880,25378595790818821816320, 1488230641037882346324480] |