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 | 11 |
| 2 | 93 |
| 3 | 723 |
| 4 | 5437 |
| 5 | 40323 |
| 6 | 297469 |
| 7 | 2191875 |
| 8 | 16164861 |
| 9 | 119443459 |
| 10 | 884719613 |
| 11 | 6570430467 |
| 12 | 48927031293 |
| 13 | 365303660547 |
| 14 | 2734459846653 |
| 15 | 20518848036867 |
| 16 | 154328140087293 |
| 17 | 1163305103130627 |
| 18 | 8787088644243453 |