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 | 10 |
| 3 | 190 |
| 4 | 2890 |
| 5 | 38890 |
| 6 | 488890 |
| 7 | 5888890 |
| 8 | 68888890 |
| 9 | 788888890 |
| 10 | 8888888890 |
| 11 | 98888888890 |
| 12 | 1088888888890 |
| 13 | 11888888888890 |
| 14 | 128888888888890 |
| 15 | 1388888888888890 |
| 16 | 14888888888888890 |
| 17 | 158888888888888890 |
| 18 | 1688888888888888890 |
| 19 | 17888888888888888890 |
| 20 | 188888888888888888890 |