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 | 2 |
| 1 | 4 |
| 2 | 48 |
| 3 | 256 |
| 4 | 1792 |
| 5 | 11264 |
| 6 | 73728 |
| 7 | 475136 |
| 8 | 3080192 |
| 9 | 19922944 |
| 10 | 128974848 |
| 11 | 834666496 |
| 12 | 5402263552 |
| 13 | 34963718144 |
| 14 | 226291089408 |
| 15 | 1464583847936 |
| 16 | 9478992822272 |
| 17 | 61349312856064 |
| 18 | 397061136580608 |
| 19 | 2569833552019456 |
| 20 | 16632312393367552 |
| 21 | 107646586405781504 |
| 22 | 696703343917006848 |