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 | -2 |
| 4 | 3 |
| 5 | -4 |
| 6 | 5 |
| 7 | -7 |
| 8 | 10 |
| 9 | -13 |
| 10 | 16 |
| 11 | -21 |
| 12 | 28 |
| 13 | -35 |
| 14 | 43 |
| 15 | -55 |
| 16 | 70 |
| 17 | -86 |
| 18 | 105 |
| 19 | -130 |
| 20 | 161 |
| 21 | -196 |
| 22 | 236 |
| 23 | -287 |
| 24 | 350 |
| 25 | -420 |
| 26 | 501 |
| 27 | -602 |
| 28 | 722 |
| 29 | -858 |
| 30 | 1016 |
| 31 | -1206 |
| 32 | 1431 |
| 33 | -1687 |
| 34 | 1981 |
| 35 | -2331 |
| 36 | 2741 |
| 37 | -3206 |
| 38 | 3740 |
| 39 | -4368 |
| 40 | 5096 |
| 41 | -5922 |
| 42 | 6868 |
| 43 | -7967 |
| 44 | 9233 |
| 45 | -10670 |
| 46 | 12306 |
| 47 | -14193 |