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 | 1 |
| 2 | 10461394944000 |
| 3 | 966187670124561330979955705263018184235392874121937659790977508286065029948982009376030755708290990080000000000000000000 |