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 | 2 |
| 1 | 4 |
| 2 | 28 |
| 3 | 460 |
| 4 | 10774 |
| 5 | 80195104 |
| 6 | 2894790054826 |
| 7 | 122274810705200924689300 |
| 8 | 17750307143185064814011639706060016204 |