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 | 4 |
| 1 | 0 |
| 2 | 12 |
| 3 | -8 |
| 4 | 20 |
| 5 | -12 |
| 6 | 44 |
| 7 | -44 |
| 8 | 60 |
| 9 | -44 |
| 10 | 92 |
| 11 | -80 |
| 12 | 116 |
| 13 | -92 |
| 14 | 188 |
| 15 | -196 |
| 16 | 220 |
| 17 | -196 |
| 18 | 268 |
| 19 | -256 |
| 20 | 292 |
| 21 | -268 |
| 22 | 364 |
| 23 | -364 |
| 24 | 412 |
| 25 | -364 |
| 26 | 508 |
| 27 | -472 |
| 28 | 580 |
| 29 | -508 |
| 30 | 796 |
| 31 | -828 |
| 32 | 876 |
| 33 | -828 |
| 34 | 972 |
| 35 | -960 |
| 36 | 996 |
| 37 | -972 |
| 38 | 1068 |
| 39 | -1068 |
| 40 | 1116 |
| 41 | -1068 |
| 42 | 1212 |
| 43 | -1176 |
| 44 | 1284 |
| 45 | -1212 |
| 46 | 1500 |
| 47 | -1524 |