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 | 23 |
| 3 | 387057611 |
| 4 | 7596040312163297274222442578036920783684137730466972969164241364503367485389656454146145546668114950475963285686810192201741431 |