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 | -2 |
| 3 | -1 |
| 4 | 2 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -8 |
| 9 | -7 |
| 10 | 6 |
| 11 | -1 |
| 12 | 10 |
| 13 | 9 |
| 14 | -8 |
| 15 | 1 |
| 16 | -24 |
| 17 | -23 |
| 18 | 22 |
| 19 | -1 |
| 20 | 26 |
| 21 | 25 |
| 22 | -24 |
| 23 | 1 |
| 24 | -32 |
| 25 | -31 |
| 26 | 30 |
| 27 | -1 |
| 28 | 34 |
| 29 | 33 |
| 30 | -32 |
| 31 | 1 |
| 32 | -64 |
| 33 | -63 |
| 34 | 62 |
| 35 | -1 |
| 36 | 66 |
| 37 | 65 |
| 38 | -64 |
| 39 | 1 |
| 40 | -72 |
| 41 | -71 |
| 42 | 70 |
| 43 | -1 |
| 44 | 74 |
| 45 | 73 |
| 46 | -72 |
| 47 | 1 |
| 48 | -88 |
| 49 | -87 |
| 50 | 86 |
| 51 | -1 |
| 52 | 90 |
| 53 | 89 |
| 54 | -88 |
| 55 | 1 |
| 56 | -96 |
| 57 | -95 |
| 58 | 94 |
| 59 | -1 |
| 60 | 98 |
| 61 | 97 |
| 62 | -96 |
| 63 | 1 |
| 64 | -160 |
| 65 | -159 |
| 66 | 158 |
| 67 | -1 |
| 68 | 162 |
| 69 | 161 |
| 70 | -160 |
| 71 | 1 |
| 72 | -168 |
| 73 | -167 |
| 74 | 166 |
| 75 | -1 |
| 76 | 170 |
| 77 | 169 |