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 | 8 |
| 4 | 32 |
| 5 | 64 |
| 6 | 384 |
| 7 | 768 |
| 8 | 6144 |
| 9 | 12288 |
| 10 | 122880 |
| 11 | 245760 |
| 12 | 2949120 |
| 13 | 5898240 |
| 14 | 82575360 |
| 15 | 165150720 |
| 16 | 2642411520 |
| 17 | 5284823040 |
| 18 | 95126814720 |
| 19 | 190253629440 |
| 20 | 3805072588800 |