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 | 2 |
| 2 | 5 |
| 3 | 21 |
| 4 | 568 |
| 5 | 539379 |
| 6 | 620246356844 |
| 7 | 692770666469748075583580 |
| 8 | 1025344764595988314871439935857378400856992018101 |