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 | 15 |
| 2 | 203 |
| 3 | 36401 |
| 4 | 4213597 |
| 5 | 8195008751 |
| 6 | 3376465219485 |
| 7 | 22530453266592757 |
| 8 | 20538493137072741201 |