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 | 5 |
| 3 | 58 |
| 4 | 1398 |
| 5 | 55896 |
| 6 | 3353880 |
| 7 | 281725200 |
| 8 | 31553227440 |
| 9 | 4543664711040 |
| 10 | 817859648350080 |