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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 45 |
| 5 | 141 |
| 6 | 447 |
| 7 | 1414 |
| 8 | 4472 |
| 9 | 14142 |
| 10 | 44721 |
| 11 | 141421 |
| 12 | 447214 |
| 13 | 1414214 |
| 14 | 4472136 |
| 15 | 14142136 |
| 16 | 44721360 |
| 17 | 141421356 |
| 18 | 447213595 |
| 19 | 1414213562 |
| 20 | 4472135955 |
| 21 | 14142135624 |
| 22 | 44721359550 |
| 23 | 141421356237 |
| 24 | 447213595500 |
| 25 | 1414213562373 |
| 26 | 4472135955000 |
| 27 | 14142135623731 |