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 | 4 |
| 3 | 13 |
| 4 | 13 |
| 5 | 13 |
| 6 | 287 |
| 7 | 287 |
| 8 | 2971 |
| 9 | 2971 |
| 10 | 27163 |
| 11 | 27163 |
| 12 | 90163 |
| 13 | 90163 |
| 14 | 5940609 |
| 15 | 5940609 |
| 16 | 6069129 |
| 17 | 6069129 |
| 18 | 276404649 |
| 19 | 276404649 |