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 | 5 |
| 3 | 11 |
| 4 | 221 |
| 5 | 24311 |
| 6 | 1182000821 |
| 7 | 698562969831336611 |
| 8 | 975980445639153806859347417915257421 |
| 9 | 476268915135000629546288739757931900755190480621127468115605921390156911 |