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 | 19134 |
| 1 | 130239 |
| 2 | 1241289 |
| 3 | 12351789 |
| 4 | 123456789 |
| 5 | 1234506789 |
| 6 | 12345006789 |
| 7 | 123450006789 |
| 8 | 1234500006789 |
| 9 | 12345000006789 |
| 10 | 123450000006789 |
| 11 | 1234500000006789 |
| 12 | 12345000000006789 |
| 13 | 123450000000006789 |
| 14 | 1234500000000006789 |
| 15 | 12345000000000006789 |
| 16 | 123450000000000006789 |
| 17 | 1234500000000000006789 |