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) |
|---|---|
| 2 | 2 |
| 3 | 13 |
| 4 | 23 |
| 5 | 347 |
| 6 | 4241 |
| 7 | 41177 |
| 8 | 1677721 |
| 9 | 9224297 |
| 10 | 769230769 |
| 11 | 17831979413 |
| 12 | 156422814881 |
| 13 | 43267872370321 |
| 14 | 317485909301657 |
| 15 | 10680338789777057 |
| 16 | 348051774975651917 |
| 17 | 23635436053895336119 |
| 18 | 230095953656704898101 |