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) |
|---|---|
| 0 | 1 |
| 1 | -1 |
| 2 | 0 |
| 3 | -2 |
| 4 | 2 |
| 5 | -1 |
| 6 | 2 |
| 7 | -2 |
| 8 | 3 |
| 9 | -4 |
| 10 | 4 |
| 11 | -4 |
| 12 | 7 |
| 13 | -7 |
| 14 | 6 |
| 15 | -10 |
| 16 | 11 |
| 17 | -11 |
| 18 | 14 |
| 19 | -16 |
| 20 | 17 |
| 21 | -21 |
| 22 | 22 |
| 23 | -24 |
| 24 | 32 |
| 25 | -34 |
| 26 | 34 |
| 27 | -44 |
| 28 | 49 |
| 29 | -50 |
| 30 | 60 |
| 31 | -66 |
| 32 | 72 |
| 33 | -84 |
| 34 | 90 |
| 35 | -98 |
| 36 | 117 |
| 37 | -125 |
| 38 | 132 |
| 39 | -156 |
| 40 | 171 |
| 41 | -181 |
| 42 | 206 |
| 43 | -226 |
| 44 | 245 |
| 45 | -277 |
| 46 | 298 |
| 47 | -322 |
| 48 | 369 |
| 49 | -397 |
| 50 | 422 |
| 51 | -480 |
| 52 | 522 |
| 53 | -557 |
| 54 | 620 |
| 55 | -674 |
| 56 | 728 |
| 57 | -807 |
| 58 | 868 |
| 59 | -936 |
| 60 | 1043 |
| 61 | -1121 |
| 62 | 1198 |