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 | 23 |
| 2 | 4567891 |
| 3 | 23456789 |
| 4 | 1234567891 |
| 5 | 23456789123456789 |
| 6 | 23456789123456789123 |
| 7 | 4567891234567891234567891 |
| 8 | 1234567891234567891234567891 |
| 9 | 7891234567891234567891234567891 |