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 | 1 |
| 2 | 65536 |
| 3 | 16777216 |
| 4 | 2199023255552 |
| 5 | 1684996666696914987166688442938726917102321526408785780068975640576 |