This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 4 |
| 4 | -1 |
| 5 | 1 |
| 6 | -4 |
| 7 | 1 |
| 8 | -1 |
| 9 | 13 |
| 10 | -11 |
| 11 | 12 |
| 12 | -16 |
| 13 | 14 |
| 14 | -15 |
| 15 | 19 |
| 16 | -1 |
| 17 | 1 |
| 18 | -13 |
| 19 | 1 |
| 20 | -11 |
| 21 | 25 |
| 22 | -12 |
| 23 | 24 |
| 24 | -40 |
| 25 | 26 |
| 26 | -14 |
| 27 | 40 |
| 28 | -15 |
| 29 | 1 |
| 30 | -29 |
| 31 | 1 |
| 32 | -1 |
| 33 | 48 |
| 34 | -35 |
| 35 | 36 |
| 36 | -61 |
| 37 | 38 |
| 38 | -39 |
| 39 | 56 |
| 40 | -11 |
| 41 | 1 |
| 42 | -39 |
| 43 | 1 |
| 44 | -12 |
| 45 | 73 |
| 46 | -24 |
| 47 | 48 |
| 48 | -88 |
| 49 | 50 |
| 50 | -36 |
| 51 | 55 |
| 52 | -14 |
| 53 | 1 |
| 54 | -40 |
| 55 | 12 |
| 56 | -15 |
| 57 | 61 |
| 58 | -59 |
| 59 | 60 |
| 60 | -101 |
| 61 | 62 |
| 62 | -63 |
| 63 | 97 |
| 64 | -1 |
| 65 | 14 |
| 66 | -48 |
| 67 | 1 |
| 68 | -35 |
| 69 | 96 |
| 70 | -60 |
| 71 | 72 |
| 72 | -157 |
| 73 | 74 |
| 74 | -38 |
| 75 | 119 |
| 76 | -39 |
| 77 | 12 |
| 78 | -56 |
| 79 | 1 |
| 80 | -11 |
| 81 | 121 |
| 82 | -83 |
| 83 | 84 |
| 84 | -135 |
| 85 | 86 |
| 86 | -87 |
| 87 | 91 |
| 88 | -12 |
| 89 | 1 |
| 90 | -83 |
| 91 | 14 |
| 92 | -24 |
| 93 | 97 |
| 94 | -48 |
| 95 | 96 |
| 96 | -184 |
| 97 | 98 |
| 98 | -64 |
| 99 | 156 |
| 100 | -36 |
| 101 | 1 |
| 102 | -89 |
| 103 | 1 |
| 104 | -14 |
| 105 | 180 |
| 106 | -107 |
| 107 | 108 |
| 108 | -196 |
| 109 | 110 |
| 110 | -132 |
| 111 | 152 |
| 112 | -15 |
| 113 | 1 |
| 114 | -99 |
| 115 | 24 |
| 116 | -59 |
| 117 | 182 |
| 118 | -60 |
| 119 | 120 |
| 120 | -245 |
| 121 | 133 |