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 | 89 |
| 3 | 659 |
| 4 | 4721 |
| 5 | 33371 |
| 6 | 234569 |
| 7 | 1644899 |
| 8 | 11523041 |
| 9 | 80687531 |
| 10 | 564891449 |
| 11 | 3954476339 |
| 12 | 27682042961 |
| 13 | 193776426491 |
| 14 | 1356441362729 |
| 15 | 9495108670979 |
| 16 | 66465818092481 |
| 17 | 465260898834251 |
| 18 | 3256826808400409 |
| 19 | 22797789208484819 |