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 | 5 |
| 1 | 110 |
| 2 | 1330670 |
| 3 | 2356194280407770990 |
| 4 | 13080769480548649962914459850235688797656360638877986030 |