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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 3 |
| 3 | -4 |
| 4 | 7 |
| 5 | -9 |
| 6 | 13 |
| 7 | -16 |
| 8 | 21 |
| 9 | -25 |
| 10 | 31 |
| 11 | -36 |
| 12 | 43 |
| 13 | -49 |
| 14 | 57 |
| 15 | -64 |
| 16 | 73 |
| 17 | -81 |
| 18 | 91 |
| 19 | -100 |
| 20 | 111 |
| 21 | -121 |
| 22 | 133 |
| 23 | -144 |
| 24 | 157 |
| 25 | -169 |
| 26 | 183 |
| 27 | -196 |
| 28 | 211 |
| 29 | -225 |
| 30 | 241 |
| 31 | -256 |
| 32 | 273 |
| 33 | -289 |
| 34 | 307 |
| 35 | -324 |
| 36 | 343 |
| 37 | -361 |
| 38 | 381 |
| 39 | -400 |
| 40 | 421 |
| 41 | -441 |
| 42 | 463 |
| 43 | -484 |
| 44 | 507 |
| 45 | -529 |
| 46 | 553 |
| 47 | -576 |
| 48 | 601 |
| 49 | -625 |
| 50 | 651 |
[1,-1,3,-4,7,-9,13,-16,21,-25,31,-36,43,-49,57, -64,73,-81,91,-100,111,-121,133,-144,157,-169,183, -196,211,-225,241,-256,273,-289,307,-324,343,-361, 381,-400,421,-441,463,-484,507,-529,553,-576,601, -625,651] |