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 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 24 |
| 6 | 93 |
| 7 | 483 |
| 8 | 2832 |
| 9 | 17515 |
| 10 | 123226 |
| 11 | 978405 |
| 12 | 8312802 |
| 13 | 75966887 |
| 14 | 756376739 |
| 15 | 8070649675 |
| 16 | 91320842018 |
| 17 | 1099612368110 |
| 18 | 14054043139523 |
| 19 | 189320856378432 |
| 20 | 2682416347625463 |
| 21 | 39945105092501742 |
| 22 | 623240458310527252 |
| 23 | 10160826473676346731 |
| 24 | 172871969109661492526 |