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 | 13 |
| 2 | 37 |
| 3 | 433 |
| 4 | 1261 |
| 5 | 14701 |
| 6 | 42841 |
| 7 | 499393 |
| 8 | 1455337 |
| 9 | 16964653 |
| 10 | 49438621 |
| 11 | 576298801 |
| 12 | 1679457781 |
| 13 | 19577194573 |
| 14 | 57052125937 |
| 15 | 665048316673 |
| 16 | 1938092824081 |
| 17 | 22592065572301 |
| 18 | 65838103892821 |
| 19 | 767465181141553 |
| 20 | 2236557439531837 |
| 21 | 26071224093240493 |