The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 0 |
| 5 | -1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 0 |
| 9 | -1 |
| 10 | -1 |
| 11 | 1 |
| 12 | 1 |
| 13 | 1 |
| 14 | 0 |
| 15 | -1 |
| 16 | -1 |
| 17 | -1 |
| 18 | 1 |
| 19 | 2 |
| 20 | 3 |
| 21 | 3 |
| 22 | 2 |
| 23 | 0 |
| 24 | -2 |
| 25 | -3 |
| 26 | -3 |
| 27 | -2 |
| 28 | -1 |
| 29 | 1 |
| 30 | 1 |
| 31 | 2 |
| 32 | 2 |
| 33 | 2 |
| 34 | 1 |
| 35 | 0 |
| 36 | -1 |
| 37 | -2 |
| 38 | -2 |
| 39 | -2 |
| 40 | -1 |
| 41 | -1 |
| 42 | 1 |
| 43 | 2 |
| 44 | 4 |
| 45 | 6 |
| 46 | 8 |
| 47 | 9 |
| 48 | 9 |
| 49 | 7 |
| 50 | 4 |
| 51 | 0 |
| 52 | -4 |
| 53 | -7 |
| 54 | -9 |
| 55 | -9 |
| 56 | -8 |
| 57 | -6 |
| 58 | -4 |
| 59 | -2 |
| 60 | -1 |
| 61 | 1 |
| 62 | 2 |
| 63 | 4 |
| 64 | 6 |
| 65 | 9 |
| 66 | 11 |
| 67 | 13 |
| 68 | 13 |
| 69 | 12 |
| 70 | 9 |
| 71 | 5 |
| 72 | 0 |
| 73 | -5 |
| 74 | -9 |
| 75 | -12 |
| 76 | -13 |
| 77 | -13 |
| 78 | -11 |
| 79 | -9 |
| 80 | -6 |
| 81 | -4 |
| 82 | -2 |
| 83 | -1 |
| 84 | 1 |
| 85 | 2 |
| 86 | 4 |
| 87 | 7 |
| 88 | 11 |
| 89 | 15 |
| 90 | 20 |
| 91 | 24 |
| 92 | 27 |
| 93 | 28 |
| 94 | 27 |
| 95 | 23 |
| 96 | 17 |
| 97 | 9 |
| 98 | 0 |
| 99 | -9 |
[1,1,-1,1,0,-1,1,1,0,-1,-1,1,1,1,0,-1,-1,-1,1,2,3, 3,2,0,-2,-3,-3,-2,-1,1,1,2,2,2,1,0,-1,-2,-2,-2,-1, -1,1,2,4,6,8,9,9,7,4,0,-4,-7,-9,-9,-8,-6,-4,-2,-1, 1,2,4,6,9,11,13,13,12,9,5,0,-5,-9,-12,-13,-13,-11, -9,-6,-4,-2,-1,1,2,4,7,11,15,20,24,27,28,27,23,17, 9,0,-9] |