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 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | -99 |
| 11 | 0 |
| 12 | 99 |
| 13 | 198 |
| 14 | 297 |
| 15 | 396 |
| 16 | 495 |
| 17 | 594 |
| 18 | 693 |
| 19 | 792 |
| 20 | -198 |
| 21 | -99 |
| 22 | 0 |
| 23 | 99 |
| 24 | 198 |
| 25 | 297 |
| 26 | 396 |
| 27 | 495 |
| 28 | 594 |
| 29 | 693 |
| 30 | -297 |