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 | 0 |
| 8 | 2 |
| 9 | -3 |
| 10 | 2 |
| 11 | 0 |
| 12 | -2 |
| 13 | 4 |
| 14 | -5 |
| 15 | 3 |
| 16 | 2 |
| 17 | -7 |
| 18 | 9 |
| 19 | -7 |
| 20 | 1 |
| 21 | 8 |
| 22 | -16 |
| 23 | 17 |
| 24 | -8 |
| 25 | -8 |
| 26 | 24 |
| 27 | -32 |
| 28 | 25 |
| 29 | -1 |
| 30 | -32 |
| 31 | 57 |
| 32 | -57 |
| 33 | 25 |
| 34 | 31 |
| 35 | -88 |
| 36 | 114 |
| 37 | -83 |
| 38 | -6 |
| 39 | 120 |
| 40 | -202 |
| 41 | 196 |
| 42 | -77 |
| 43 | -125 |
| 44 | 322 |
| 45 | -399 |
| 46 | 273 |
| 47 | 49 |
| 48 | -447 |
| 49 | 720 |
| 50 | -672 |
| 51 | 225 |
| 52 | 496 |
| 53 | -1168 |
| 54 | 1392 |
| 55 | -896 |
| 56 | -271 |
| 57 | 1663 |
| 58 | -2560 |