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 | 2 |
| 2 | 4 |
| 3 | 12 |
| 4 | 16 |
| 5 | 48 |
| 6 | 144 |
| 7 | 720 |
| 8 | 1296 |
| 9 | 6480 |
| 10 | 32400 |
| 11 | 184320 |
| 12 | 331776 |
| 13 | 1658880 |
| 14 | 8294400 |
| 15 | 58060800 |
| 16 | 65536 |
| 17 | 196608 |
| 18 | 589824 |
| 19 | 2949120 |
| 20 | 5308416 |
| 21 | 26542080 |
| 22 | 132710400 |
| 23 | 928972800 |
| 24 | 3317760000 |
| 25 | 23224320000 |
| 26 | 162570240000 |
| 27 | 1788272640000 |
| 28 | 7965941760000 |
| 29 | 87625359360000 |