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 | 1 |
| 1 | 3 |
| 2 | 26 |
| 3 | 254 |
| 4 | 2526 |
| 5 | 25270 |
| 6 | 252666 |
| 7 | 2526605 |
| 8 | 25266035 |
| 9 | 252660259 |
| 10 | 2526602596 |
| 11 | 25266025903 |
| 12 | 252660259016 |
| 13 | 2526602590093 |