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 | 9 |
| 3 | 21 |
| 4 | 93 |
| 5 | 381 |
| 6 | 6596 |
| 7 | 20995 |
| 8 | 24573 |
| 9 | 57823 |
| 10 | 62359 |
| 11 | 98756 |
| 12 | 208148 |
| 13 | 393213 |
| 14 | 400844 |
| 15 | 405788 |
| 16 | 418756 |
| 17 | 1572861 |
| 18 | 6460508 |