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 | 883 |
| 4 | 237051898781 |
| 5 | 17911135064090123664377811162569837 |
| 6 | 1230843829352095122161574066100819070684162503 |