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 | -2 |
| 2 | 2 |
| 3 | -3 |
| 4 | 5 |
| 5 | -7 |
| 6 | 9 |
| 7 | -11 |
| 8 | 13 |
| 9 | -16 |
| 10 | 20 |
| 11 | -23 |
| 12 | 26 |
| 13 | -31 |
| 14 | 36 |
| 15 | -41 |
| 16 | 48 |
| 17 | -55 |
| 18 | 62 |
| 19 | -71 |
| 20 | 81 |
| 21 | -92 |
| 22 | 104 |
| 23 | -116 |
| 24 | 129 |
| 25 | -145 |
| 26 | 163 |
| 27 | -180 |
| 28 | 198 |
| 29 | -219 |
| 30 | 242 |
| 31 | -267 |
| 32 | 293 |
| 33 | -320 |
| 34 | 349 |
| 35 | -381 |
| 36 | 416 |
| 37 | -452 |
| 38 | 489 |
| 39 | -529 |
| 40 | 572 |
| 41 | -618 |
| 42 | 668 |
| 43 | -719 |
| 44 | 771 |
| 45 | -829 |
| 46 | 892 |
| 47 | -956 |
| 48 | 1023 |
| 49 | -1094 |
| 50 | 1167 |
| 51 | -1246 |
| 52 | 1331 |
| 53 | -1416 |
| 54 | 1504 |