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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 2 |
| 3 | -1 |
| 4 | 5 |
| 5 | -3 |
| 6 | 9 |
| 7 | -6 |
| 8 | 14 |
| 9 | -10 |
| 10 | 20 |
| 11 | -15 |
| 12 | 27 |
| 13 | -21 |
| 14 | 35 |
| 15 | -28 |
| 16 | 44 |
| 17 | -36 |
| 18 | 54 |
| 19 | -45 |
| 20 | 65 |
| 21 | -55 |
| 22 | 77 |
| 23 | -66 |
| 24 | 90 |
| 25 | -78 |
| 26 | 104 |
| 27 | -91 |
| 28 | 119 |
| 29 | -105 |
| 30 | 135 |
| 31 | -120 |
| 32 | 152 |
| 33 | -136 |
| 34 | 170 |
| 35 | -153 |
| 36 | 189 |
| 37 | -171 |
| 38 | 209 |
| 39 | -190 |
| 40 | 230 |
| 41 | -210 |
| 42 | 252 |
| 43 | -231 |
| 44 | 275 |
| 45 | -253 |
| 46 | 299 |
| 47 | -276 |
| 48 | 324 |
| 49 | -300 |
| 50 | 350 |
| 51 | -325 |
| 52 | 377 |
| 53 | -351 |
| 54 | 405 |
[0,0,2,-1,5,-3,9,-6,14,-10,20,-15,27,-21,35,-28, 44,-36,54,-45,65,-55,77,-66,90,-78,104,-91,119, -105,135,-120,152,-136,170,-153,189,-171,209,-190, 230,-210,252,-231,275,-253,299,-276,324,-300,350, -325,377,-351,405] |