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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 602 |
| 5 | 373780 |
| 6 | 33093252880 |
| 7 | 14216413305846436 |
| 8 | 2562708724272040433794232 |
| 9 | 2209363619821632289359062591728192 |