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 | 6 |
| 2 | 48 |
| 3 | 468 |
| 4 | 5328 |
| 5 | 68928 |
| 6 | 994464 |
| 7 | 15781920 |
| 8 | 272594160 |
| 9 | 5081825664 |