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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -5 |
| 2 | 10 |
| 3 | -15 |
| 4 | 30 |
| 5 | -56 |
| 6 | 85 |
| 7 | -130 |
| 8 | 205 |
| 9 | -315 |
| 10 | 465 |
| 11 | -665 |
| 12 | 960 |
| 13 | -1380 |
| 14 | 1925 |
| 15 | -2651 |
| 16 | 3660 |
| 17 | -5020 |
| 18 | 6775 |
| 19 | -9070 |
| 20 | 12126 |
| 21 | -16115 |
| 22 | 21220 |
| 23 | -27765 |
| 24 | 36235 |
| 25 | -47101 |
| 26 | 60810 |
| 27 | -78115 |
| 28 | 100105 |
| 29 | -127825 |
| 30 | 162391 |
| 31 | -205530 |
| 32 | 259475 |
| 33 | -326565 |
[1,-5,10,-15,30,-56,85,-130,205,-315,465,-665,960, -1380,1925,-2651,3660,-5020,6775,-9070,12126, -16115,21220,-27765,36235,-47101,60810,-78115, 100105,-127825,162391,-205530,259475,-326565] |