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 | 2 |
| 2 | 13 |
| 3 | 23 |
| 4 | 107 |
| 5 | 4241 |
| 6 | 6011 |
| 7 | 212369 |
| 8 | 2600137 |
| 9 | 769230769 |
| 10 | 16783039447 |
| 11 | 49260223471 |
| 12 | 43267872370321 |
| 13 | 156507138388141 |
| 14 | 10680338789777057 |
| 15 | 348051774975651917 |
| 16 | 1529094753948866477 |
| 17 | 199727959773078870941 |
| 18 | 32433109109185468674163 |