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 | 2 |
| 3 | 192 |
| 4 | 6115295232 |
| 5 | 15436756676507918107049554083840 |
| 6 | 18356962141505758798331790171539976807981714702571497465907439808868887035904000000 |