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 | 4 |
| 2 | 3 |
| 3 | 13 |
| 4 | 13 |
| 5 | 513 |
| 6 | 801 |
| 7 | 6781 |
| 8 | 30721 |
| 9 | 40513 |
| 10 | 1057513 |
| 11 | 515313 |
| 12 | 16728501 |
| 13 | 78402181 |
| 14 | 13617661 |
| 15 | 472012281 |
| 16 | 64846161 |
| 17 | 5481873013 |
| 18 | 2459693601 |
| 19 | 116852093013 |
| 20 | 62611784481 |
| 21 | 1234170737761 |
| 22 | 1565435686113 |
| 23 | 17492477581161 |
| 24 | 2254878102513 |
| 25 | 16836143444113 |
| 26 | 229959946206301 |