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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -2 |
| 3 | -3 |
| 4 | -4 |
| 5 | -5 |
| 6 | 0 |
| 7 | -7 |
| 8 | 0 |
| 9 | -9 |
| 10 | 0 |
| 11 | -11 |
| 12 | 12 |
| 13 | -13 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | -17 |
| 18 | 18 |
| 19 | -19 |
| 20 | 20 |
| 21 | 0 |
| 22 | 0 |
| 23 | -23 |
| 24 | 24 |
| 25 | -25 |
| 26 | 0 |
| 27 | 0 |
| 28 | 28 |
| 29 | -29 |
| 30 | 30 |
| 31 | -31 |
| 32 | 32 |
| 33 | 0 |
| 34 | 0 |
| 35 | 0 |
| 36 | 36 |
| 37 | -37 |
| 38 | 0 |
| 39 | 0 |
| 40 | 40 |
| 41 | -41 |
| 42 | 42 |
| 43 | -43 |
| 44 | 44 |
| 45 | 45 |
| 46 | 0 |
| 47 | -47 |
| 48 | 48 |
| 49 | -49 |
| 50 | 50 |
| 51 | 0 |
| 52 | 52 |
| 53 | -53 |
| 54 | 54 |
| 55 | 0 |
| 56 | 56 |
| 57 | 0 |
| 58 | 0 |
| 59 | -59 |
| 60 | 60 |
| 61 | -61 |
| 62 | 0 |
| 63 | 63 |
| 64 | 0 |
| 65 | 0 |
| 66 | 66 |
| 67 | -67 |
| 68 | 68 |
| 69 | 0 |
| 70 | 70 |
| 71 | -71 |
| 72 | 72 |
| 73 | -73 |
| 74 | 0 |
| 75 | 75 |
| 76 | 76 |
| 77 | 0 |
| 78 | 78 |
| 79 | -79 |
| 80 | 80 |
| 81 | 0 |
| 82 | 0 |
| 83 | -83 |
| 84 | 84 |
| 85 | 0 |
| 86 | 0 |
| 87 | 0 |
| 88 | 88 |
| 89 | -89 |
| 90 | 90 |
[1,-2,-3,-4,-5,0,-7,0,-9,0,-11,12,-13,0,0,0,-17, 18,-19,20,0,0,-23,24,-25,0,0,28,-29,30,-31,32,0,0, 0,36,-37,0,0,40,-41,42,-43,44,45,0,-47,48,-49,50, 0,52,-53,54,0,56,0,0,-59,60,-61,0,63,0,0,66,-67, 68,0,70,-71,72,-73,0,75,76,0,78,-79,80,0,0,-83,84, 0,0,0,88,-89,90] |