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 | 6 |
| 2 | 63 |
| 3 | 392 |
| 4 | 1764 |
| 5 | 6352 |
| 6 | 19404 |
| 7 | 52272 |
| 8 | 127413 |
| 9 | 286286 |
| 10 | 601203 |
| 11 | 1192464 |
| 12 | 2252432 |
| 13 | 4078368 |
| 14 | 7116336 |
| 15 | 12018704 |
| 16 | 19718181 |
| 17 | 31521798 |
| 18 | 49228487 |
| 19 | 75274584 |
| 20 | 112911880 |
| 21 | 166423400 |
| 22 | 241382700 |
| 23 | 344962800 |
| 24 | 486301725 |
| 25 | 676932006 |
| 26 | 931282191 |
| 27 | 1267259168 |