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) |
|---|---|
| 1 | 5 |
| 2 | 15 |
| 3 | 29 |
| 4 | 91 |
| 5 | 197 |
| 6 | 627 |
| 7 | 1477 |
| 8 | 4671 |
| 9 | 11693 |
| 10 | 36487 |
| 11 | 95405 |
| 12 | 293695 |
| 13 | 792525 |
| 14 | 2412175 |
| 15 | 6660989 |
| 16 | 20097243 |
| 17 | 56450693 |
| 18 | 169229571 |
| 19 | 481426405 |
| 20 | 1436666475 |
| 21 | 4126292293 |
| 22 | 12275100443 |
| 23 | 35511918037 |
| 24 | 105423983379 |
| 25 | 306684489749 |
| 26 | 909271908483 |