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 | -1 |
| 3 | 5 |
| 4 | -5 |
| 5 | 1 |
| 6 | 13 |
| 7 | -19 |
| 8 | 8 |
| 9 | -1 |
| 10 | 34 |
| 11 | -65 |
| 12 | 42 |
| 13 | -11 |
| 14 | 1 |
| 15 | 89 |
| 16 | -210 |
| 17 | 183 |
| 18 | -74 |
| 19 | 14 |
| 20 | -1 |
| 21 | 233 |
| 22 | -654 |
| 23 | 717 |
| 24 | -394 |
| 25 | 115 |
| 26 | -17 |
| 27 | 1 |
| 28 | 610 |
| 29 | -1985 |
| 30 | 2622 |
| 31 | -1825 |
| 32 | 725 |
| 33 | -165 |
| 34 | 20 |
| 35 | -1 |
| 36 | 1597 |
| 37 | -5911 |
| 38 | 9134 |
| 39 | -7703 |
| 40 | 3885 |
| 41 | -1203 |
| 42 | 224 |
| 43 | -23 |
| 44 | 1 |
| 45 | 4181 |
| 46 | -17345 |
| 47 | 30691 |
| 48 | -30418 |
| 49 | 18633 |
| 50 | -7329 |