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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -20 |
| 2 | 150 |
| 3 | -400 |
| 4 | -875 |
| 5 | 7396 |
| 6 | -7770 |
| 7 | -36600 |
| 8 | 56510 |
| 9 | 154660 |
| 10 | -872 |
| 11 | -1314200 |
| 12 | -455605 |
| 13 | 6284960 |
| 14 | 3781830 |
| 15 | -9954864 |
| 16 | -43558410 |
| 17 | -16664680 |
| 18 | 165132890 |
| 19 | 229738040 |
| 20 | 57372644 |
| 21 | -1326447180 |
| 22 | -2095012310 |
| 23 | 1723402120 |
| 24 | 7805180205 |
[1,-20,150,-400,-875,7396,-7770,-36600,56510, 154660,-872,-1314200,-455605,6284960,3781830, -9954864,-43558410,-16664680,165132890,229738040, 57372644,-1326447180,-2095012310,1723402120, 7805180205] |