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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 54 |
| 4 | 104 |
| 5 | 18810 |
| 6 | -1648428 |
| 7 | 247726374 |
| 8 | -49445941200 |
| 9 | 12841169289714 |
| 10 | -4206667789245780 |
| 11 | 1697448414191239710 |
| 12 | -827415782970517712376 |
| 13 | 479396168140498731959850 |
| 14 | -325673237888367403728512700 |
| 15 | 256401822876859593450127851030 |
| 16 | -231597610351491427264049084814240 |
[1,2,8,54,104,18810,-1648428,247726374, -49445941200,12841169289714,-4206667789245780, 1697448414191239710,-827415782970517712376, 479396168140498731959850, -325673237888367403728512700, 256401822876859593450127851030, -231597610351491427264049084814240] |