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 | 16 |
| 4 | 83521 |
| 5 | 48698490414981476161 |
| 6 | 5624216052381164150697569400035392464306474190030694298257503425709420810383376 |