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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 0 |
| 4 | -5 |
| 5 | -7 |
| 6 | 0 |
| 7 | 12 |
| 8 | 15 |
| 9 | 0 |
| 10 | -22 |
| 11 | -26 |
| 12 | 0 |
| 13 | 35 |
| 14 | 40 |
| 15 | 0 |
| 16 | -51 |
| 17 | -57 |
| 18 | 0 |
| 19 | 70 |
| 20 | 77 |
| 21 | 0 |
| 22 | -92 |
| 23 | -100 |
| 24 | 0 |
| 25 | 117 |
| 26 | 126 |
| 27 | 0 |
| 28 | -145 |
| 29 | -155 |
| 30 | 0 |
| 31 | 176 |
| 32 | 187 |
| 33 | 0 |
| 34 | -210 |
| 35 | -222 |
| 36 | 0 |
| 37 | 247 |
| 38 | 260 |
| 39 | 0 |
| 40 | -287 |
| 41 | -301 |
| 42 | 0 |
| 43 | 330 |
| 44 | 345 |
| 45 | 0 |
| 46 | -376 |
| 47 | -392 |
| 48 | 0 |
| 49 | 425 |
| 50 | 442 |
| 51 | 0 |
| 52 | -477 |
| 53 | -495 |