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 | 2 |
| 3 | 8 |
| 4 | 25 |
| 5 | 102 |
| 6 | 439 |
| 7 | 2067 |
| 8 | 10406 |
| 9 | 56754 |
| 10 | 328257 |
| 11 | 2015818 |
| 12 | 13067366 |
| 13 | 89192170 |
| 14 | 638321285 |
| 15 | 4779442602 |
| 16 | 37332643831 |
| 17 | 303635437532 |
| 18 | 2565592977205 |
| 19 | 22483754207839 |
| 20 | 204013083946460 |
| 21 | 1913880812797792 |
| 22 | 18536832515581167 |
| 23 | 185130415180288134 |
| 24 | 1904280138346826637 |