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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 32 |
| 5 | 149 |
| 6 | 240 |
| 7 | -12725 |
| 8 | -378880 |
| 9 | -8550135 |
| 10 | -178474240 |
| 11 | -3550577425 |
| 12 | -65428992000 |
| 13 | -985800819875 |
| 14 | -4641229465600 |
| 15 | 548638404441075 |
| 16 | 36708748623872000 |
| 17 | 1716785996161588625 |
| 18 | 69798035394846720000 |
| 19 | 2571598453132219756375 |
| 20 | 84313566554397999104000 |
[1,2,7,32,149,240,-12725,-378880,-8550135, -178474240,-3550577425,-65428992000,-985800819875, -4641229465600,548638404441075,36708748623872000, 1716785996161588625,69798035394846720000, 2571598453132219756375,84313566554397999104000] |