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 | 13 |
| 3 | 30241 |
| 4 | 670442572801 |
| 5 | 20007974164906320568399715106816000001 |
| 6 | 31370018474571622355156067715319586116075520000001 |