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 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -2 |
| 6 | 2 |
| 7 | -3 |
| 8 | 3 |
| 9 | -3 |
| 10 | 4 |
| 11 | -5 |
| 12 | 6 |
| 13 | -7 |
| 14 | 8 |
| 15 | -9 |
| 16 | 10 |
| 17 | -12 |
| 18 | 14 |
| 19 | -16 |
| 20 | 18 |
| 21 | -20 |
| 22 | 23 |
| 23 | -26 |
| 24 | 30 |
| 25 | -34 |
| 26 | 38 |
| 27 | -42 |
| 28 | 47 |
| 29 | -53 |
| 30 | 60 |
| 31 | -67 |
| 32 | 74 |
| 33 | -82 |
| 34 | 91 |
| 35 | -102 |
| 36 | 114 |
| 37 | -126 |
| 38 | 139 |
| 39 | -153 |
| 40 | 169 |
| 41 | -187 |
| 42 | 207 |
| 43 | -228 |
| 44 | 250 |
| 45 | -274 |
| 46 | 301 |
| 47 | -331 |
| 48 | 364 |
| 49 | -399 |
| 50 | 436 |
| 51 | -476 |
| 52 | 520 |
| 53 | -569 |
| 54 | 622 |
| 55 | -679 |