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 | 4 |
| 2 | 14 |
| 3 | 58 |
| 4 | 221 |
| 5 | 911 |
| 6 | 3638 |
| 7 | 14687 |
| 8 | 61435 |
| 9 | 262189 |
| 10 | 1140171 |