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 | 1 |
| 2 | 212 |
| 3 | 3212321 |
| 4 | 4321234321234 |
| 5 | 543212345432123454321 |
| 6 | 6543212345654321234565432123456 |
| 7 | 7654321234567654321234567654321234567654321 |