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 | 3 |
| 2 | 6 |
| 3 | 21 |
| 4 | 231 |
| 5 | 26796 |
| 6 | 359026206 |
| 7 | 64449908476890321 |
| 8 | 2076895351339769460477611370186681 |
| 9 | 2156747150208372213435450937462082366919951682912789656986079991221 |