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 | 20 |
| 1 | 999 |
| 2 | 59886 |
| 3 | 5013752 |
| 4 | 604073400 |
| 5 | 105179890458 |
| 6 | 26398415877712 |
| 7 | 9510671755316374 |