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 | 4 |
| 2 | 14 |
| 3 | 7837 |
| 4 | 27049 |
| 5 | 144997771 |
| 6 | 651186838 |
| 7 | 12779564974 |
| 8 | 22369949923 |
| 9 | 149621468452 |
| 10 | 225012717952 |
| 11 | 240728320642 |
| 12 | 586832463472 |
| 13 | 766964610742 |
| 14 | 939742446571 |
| 15 | 949543082647 |
| 16 | 1908189311558 |
| 17 | 2693729868901 |
| 18 | 2701032171244 |
| 19 | 3465208973035 |
| 20 | 3489960850720 |
| 21 | 3910908182851 |