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 | 3 |
| 4 | 7 |
| 5 | 18 |
| 6 | 66 |
| 7 | 239 |
| 8 | 963 |
| 9 | 3792 |
| 10 | 15230 |
| 11 | 60297 |
| 12 | 240295 |
| 13 | 952530 |
| 14 | 3783000 |
| 15 | 14999274 |
| 16 | 59492918 |
| 17 | 235852544 |
| 18 | 935260075 |
| 19 | 3707948564 |
| 20 | 14702345112 |
| 21 | 58294850481 |
| 22 | 231152521791 |
| 23 | 916584704599 |
| 24 | 3634684693457 |
| 25 | 14413639272087 |