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 | -1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 2 |
| 7 | -2 |
| 8 | 2 |
| 9 | -3 |
| 10 | 3 |
| 11 | -3 |
| 12 | 5 |
| 13 | -5 |
| 14 | 5 |
| 15 | -7 |
| 16 | 8 |
| 17 | -8 |
| 18 | 11 |
| 19 | -12 |
| 20 | 12 |
| 21 | -16 |
| 22 | 17 |
| 23 | -18 |
| 24 | 23 |
| 25 | -25 |
| 26 | 26 |
| 27 | -32 |
| 28 | 35 |
| 29 | -37 |
| 30 | 45 |
| 31 | -49 |
| 32 | 52 |
| 33 | -62 |
| 34 | 67 |
| 35 | -72 |
| 36 | 85 |
| 37 | -92 |
| 38 | 98 |
| 39 | -114 |
| 40 | 124 |
| 41 | -133 |
| 42 | 153 |
| 43 | -166 |
| 44 | 178 |
| 45 | -203 |
| 46 | 220 |
| 47 | -236 |
| 48 | 268 |
| 49 | -290 |
| 50 | 311 |
| 51 | -350 |
| 52 | 379 |
| 53 | -407 |
| 54 | 456 |
| 55 | -493 |
| 56 | 529 |