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 | 4 |
| 1 | 724 |
| 2 | 198924689265124 |
| 3 | 311489521560905211009923410118036749078665998068304623331823899816643124 |