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 | 64 |
| 3 | 730 |
| 4 | 4160 |
| 5 | 16355 |
| 6 | 50816 |
| 7 | 134004 |
| 8 | 312960 |
| 9 | 665445 |
| 10 | 1312960 |
| 11 | 2437006 |
| 12 | 4298944 |
| 13 | 7263815 |
| 14 | 11828480 |
| 15 | 18654440 |
| 16 | 28605696 |
| 17 | 42792009 |
| 18 | 62617920 |
| 19 | 89837890 |
| 20 | 126617920 |
| 21 | 175604011 |
| 22 | 239997824 |
| 23 | 323639900 |
| 24 | 431100800 |
| 25 | 567780525 |
| 26 | 740016576 |
| 27 | 955201014 |
| 28 | 1221906880 |