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 | 0 |
| 1 | 1 |
| 2 | 36 |
| 3 | 834 |
| 4 | 8230 |
| 5 | 48915 |
| 6 | 210126 |
| 7 | 720916 |
| 8 | 2097684 |
| 9 | 5381685 |
| 10 | 12501280 |
| 11 | 26796726 |
| 12 | 53750346 |
| 13 | 101969959 |
| 14 | 184478490 |
| 15 | 320367720 |
| 16 | 536879176 |
| 17 | 871980201 |
| 18 | 1377508284 |
| 19 | 2122961770 |
| 20 | 3200020110 |
| 21 | 4727881851 |
| 22 | 6859513606 |
| 23 | 9788908284 |
| 24 | 13759455900 |