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 | 53 |
| 3 | 5323 |
| 4 | 53231 |
| 5 | 532313 |
| 6 | 5323139 |
| 7 | 532313921 |
| 8 | 5323139219 |
| 9 | 532313921921 |
| 10 | 53231392192123 |
| 11 | 5323139219212343 |
| 12 | 53231392192123433 |
| 13 | 5323139219212343323 |
| 14 | 53231392192123433237 |
| 15 | 5323139219212343323721 |
| 16 | 532313921921234332372189 |
| 17 | 53231392192123433237218937 |
| 18 | 5323139219212343323721893721 |