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