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 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 87 |
| 5 | 322 |
| 6 | 1211 |
| 7 | 4604 |
| 8 | 17645 |
| 9 | 68042 |
| 10 | 263655 |
| 11 | 1025632 |
| 12 | 4002601 |
| 13 | 15662422 |
| 14 | 61427543 |
| 15 | 241386924 |
| 16 | 950160607 |
| 17 | 3745589510 |
| 18 | 14784496003 |
| 19 | 58424093536 |
| 20 | 231112008371 |
| 21 | 915065382154 |
| 22 | 3626113490579 |
| 23 | 14379912928572 |
| 24 | 57064644495359 |