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 | 2 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 256 |
| 6 | 4194304 |
| 7 | 4503599627370496 |
| 8 | 20769187434139310514121985316880384 |
| 9 | 1766847064778384329583297500742918515827483896875618958121606201292619776 |