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 | 0 |
| 3 | 3 |
| 4 | 22 |
| 5 | 78 |
| 6 | 245 |
| 7 | 750 |
| 8 | 2057 |
| 9 | 5597 |
| 10 | 14884 |
| 11 | 38975 |
| 12 | 101629 |
| 13 | 264239 |
| 14 | 687007 |
| 15 | 1801533 |
| 16 | 4744920 |
| 17 | 12604009 |
| 18 | 33763684 |
| 19 | 91210364 |