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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 0 |
| 5 | -1 |
| 6 | 2 |
| 7 | -1 |
| 8 | -1 |
| 9 | 3 |
| 10 | -4 |
| 11 | 2 |
| 12 | 2 |
| 13 | -3 |
| 14 | 0 |
| 15 | 0 |
| 16 | 6 |
| 17 | -7 |
| 18 | -5 |
| 19 | 14 |
| 20 | -2 |
| 21 | -14 |
| 22 | 6 |
| 23 | 13 |
| 24 | -12 |
| 25 | -2 |
| 26 | 6 |
| 27 | -1 |
| 28 | -8 |
| 29 | 7 |
| 30 | 36 |
| 31 | -79 |
| 32 | 15 |
| 33 | 108 |
| 34 | -100 |
| 35 | -23 |
| 36 | 32 |
| 37 | 83 |
| 38 | -60 |
| 39 | -167 |
| 40 | 306 |
| 41 | -133 |
| 42 | -184 |
| 43 | 318 |
| 44 | -158 |
| 45 | -91 |
| 46 | 54 |
| 47 | 295 |
| 48 | -232 |
| 49 | -641 |
| 50 | 1059 |
| 51 | 180 |
| 52 | -1470 |
| 53 | 497 |
| 54 | 1404 |
| 55 | -1069 |
| 56 | -978 |
| 57 | 1396 |
| 58 | 386 |