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 | 45 |
| 4 | 142 |
| 5 | 448 |
| 6 | 1415 |
| 7 | 4473 |
| 8 | 14143 |
| 9 | 44722 |
| 10 | 141422 |
| 11 | 447214 |
| 12 | 1414214 |
| 13 | 4472136 |
| 14 | 14142136 |
| 15 | 44721360 |
| 16 | 141421357 |
| 17 | 447213596 |
| 18 | 1414213563 |
| 19 | 4472135955 |
| 20 | 14142135624 |
| 21 | 44721359550 |
| 22 | 141421356238 |
| 23 | 447213595500 |
| 24 | 1414213562374 |