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 | 18 |
| 4 | 49 |
| 5 | 529 |
| 6 | 1458 |
| 7 | 15842 |
| 8 | 43681 |
| 9 | 474721 |
| 10 | 1308962 |
| 11 | 14225778 |
| 12 | 39225169 |
| 13 | 426298609 |
| 14 | 1175446098 |
| 15 | 12774732482 |
| 16 | 35224157761 |
| 17 | 382815675841 |
| 18 | 1055549286722 |
| 19 | 11471695542738 |
| 20 | 31631254443889 |
| 21 | 343768050606289 |
| 22 | 947882084029938 |
| 23 | 10301569822645922 |
| 24 | 28404831266454241 |