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) |
|---|---|
| 1 | 4 |
| 2 | 12 |
| 3 | 56 |
| 4 | 992 |
| 5 | 16256 |
| 6 | 67100672 |
| 7 | 17179738112 |
| 8 | 274877382656 |
| 9 | 4611686016279904256 |
| 10 | 5316911983139663489309385231907684352 |
| 11 | 383123885216472214589586756168607276261994643096338432 |