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) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 2 |
| 3 | 17 |
| 4 | 347 |
| 5 | 2903 |
| 6 | 15373 |
| 7 | 128981 |
| 8 | 19641263 |
| 9 | 245333213 |
| 10 | 245333213 |
| 11 | 27797667517 |
| 12 | 68439250465123 |
| 13 | 68439250465123 |