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 | 1 |
| 7 | -1 |
| 8 | 2 |
| 9 | -2 |
| 10 | 3 |
| 11 | -3 |
| 12 | 3 |
| 13 | -4 |
| 14 | 4 |
| 15 | -5 |
| 16 | 6 |
| 17 | -6 |
| 18 | 7 |
| 19 | -8 |
| 20 | 10 |
| 21 | -11 |
| 22 | 11 |
| 23 | -13 |
| 24 | 15 |
| 25 | -17 |
| 26 | 18 |
| 27 | -20 |
| 28 | 23 |
| 29 | -25 |
| 30 | 29 |
| 31 | -32 |
| 32 | 34 |
| 33 | -39 |
| 34 | 42 |
| 35 | -47 |
| 36 | 52 |
| 37 | -56 |
| 38 | 62 |
| 39 | -68 |
| 40 | 77 |
| 41 | -83 |
| 42 | 89 |
| 43 | -99 |
| 44 | 108 |
| 45 | -119 |
| 46 | 129 |
| 47 | -139 |
| 48 | 154 |
| 49 | -167 |
| 50 | 183 |
| 51 | -199 |
| 52 | 214 |
| 53 | -234 |
| 54 | 253 |
| 55 | -276 |
| 56 | 299 |
| 57 | -322 |
| 58 | 350 |