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) |
|---|---|
| 2 | 31 |
| 3 | 10123 |
| 4 | 1389619 |
| 5 | 127780201 |
| 6 | 9622763387 |