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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | -3 |
| 7 | 5 |
| 8 | 7 |
| 9 | -9 |
| 10 | 12 |
| 11 | 15 |
| 12 | -18 |
| 13 | 22 |
| 14 | 26 |
| 15 | -30 |
| 16 | 35 |
| 17 | 40 |
| 18 | -45 |
| 19 | 51 |
| 20 | 57 |
| 21 | -63 |
| 22 | 70 |
| 23 | 77 |
| 24 | -84 |
| 25 | 92 |
| 26 | 100 |
| 27 | -108 |
| 28 | 117 |
| 29 | 126 |
| 30 | -135 |
| 31 | 145 |
| 32 | 155 |
| 33 | -165 |
| 34 | 176 |
| 35 | 187 |
| 36 | -198 |
| 37 | 210 |
| 38 | 222 |
| 39 | -234 |
| 40 | 247 |
| 41 | 260 |
| 42 | -273 |
| 43 | 287 |
| 44 | 301 |
| 45 | -315 |
| 46 | 330 |
| 47 | 345 |
| 48 | -360 |
| 49 | 376 |
| 50 | 392 |
| 51 | -408 |
| 52 | 425 |
| 53 | 442 |
| 54 | -459 |
| 55 | 477 |