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 | 3 |
| 2 | 171714816 |
| 3 | 9817265089769041882465383168 |
| 4 | 351690857158733335833718073682368165890982417955022627663773696 |