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 | 123456789 |
| 1 | 23456789 |
| 2 | 13456789 |
| 3 | 12456789 |
| 4 | 12356789 |
| 5 | 12346789 |
| 6 | 12345789 |
| 7 | 12345689 |
| 8 | 12345679 |
| 9 | 12345678 |
| 10 | 23456789 |
| 11 | 23456789 |
| 12 | 3456789 |
| 13 | 2456789 |
| 14 | 2356789 |
| 15 | 2346789 |
| 16 | 2345789 |
| 17 | 2345689 |
| 18 | 2345679 |
| 19 | 2345678 |
| 20 | 13456789 |
| 21 | 3456789 |
| 22 | 13456789 |
| 23 | 1456789 |
| 24 | 1356789 |
| 25 | 1346789 |
| 26 | 1345789 |