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 | 2 |
| 2 | 3 |
| 3 | 2 |
| 4 | -7 |
| 5 | -38 |
| 6 | -117 |
| 7 | -278 |
| 8 | -527 |
| 9 | -718 |
| 10 | -237 |
| 11 | 2642 |
| 12 | 11753 |
| 13 | 33802 |
| 14 | 76443 |
| 15 | 136762 |
| 16 | 164833 |
| 17 | -24478 |
| 18 | -922077 |
| 19 | -3565918 |
| 20 | -9653287 |
| 21 | -20783558 |
| 22 | -34867797 |
| 23 | -35553398 |
| 24 | 32125393 |
| 25 | 306268562 |
| 26 | 1064447283 |
| 27 | 2726446322 |
| 28 | 5583548873 |
| 29 | 8701963882 |