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 | 11 |
| 3 | 1 |
| 4 | 28 |
| 5 | 154 |
| 6 | 520 |
| 7 | 1574 |
| 8 | 7204 |
| 9 | 28790 |
| 10 | 105055 |
| 11 | 437163 |
| 12 | 1792603 |
| 13 | 6981116 |
| 14 | 28580319 |
| 15 | 115795593 |
| 16 | 464405679 |
| 17 | 1883192839 |
| 18 | 7625910371 |
| 19 | 30781567549 |
| 20 | 124586304213 |
| 21 | 504301473498 |
| 22 | 2038932788749 |
| 23 | 8250005089404 |
| 24 | 33384996732923 |