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 | 4 |
| 1 | 4 |
| 2 | 16 |
| 3 | 4096 |
| 4 | 281474976710656 |
| 5 | 1766847064778384329583297500742918515827483896875618958121606201292619776 |