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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 9 |
| 5 | 1241 |
| 6 | 2298661010 |
| 7 | 19127219051011953293860241761 |
| 8 | 8789440239853164630485833302292601093162389737995133605845884014903267053091248194081 |