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 | 2 |
| 2 | 13 |
| 3 | 61 |
| 4 | 2521 |
| 5 | 20161 |
| 6 | 3113510401 |
| 7 | 10461394944001 |
| 8 | 132626429906095529318154240000001 |
| 9 | 30207631531686917818677566034256998753632256000000001 |