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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 52 |
| 5 | 6331 |
| 6 | 6431 |
| 7 | 7341 |
| 8 | 7863 |
| 9 | 426115 |
| 10 | 453486 |
| 11 | 1054067 |
| 12 | 1054167 |
| 13 | 1472746 |
| 14 | 2017631 |
| 15 | 42687015 |
| 16 | 1050553507 |
| 17 | 13175129925 |
| 18 | 335038979077 |
| 19 | 1400295262095 |
| 20 | 5847307263801 |
| 21 | 51722791547842 |
| 22 | 78849864240621 |
| 23 | 105802560494387 |