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 | 4 |
| 3 | 9 |
| 4 | 203 |
| 5 | 1333 |
| 6 | 1333 |
| 7 | 1333 |
| 8 | 2159 |
| 9 | 8309 |
| 10 | 18799 |
| 11 | 60499 |
| 12 | 60499 |
| 13 | 186779 |
| 14 | 186779 |
| 15 | 186779 |
| 16 | 12015573923 |
| 17 | 12015573923 |
| 18 | 6763513182767 |