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 | 0 |
| 1 | 10 |
| 2 | 25 |
| 3 | 39 |
| 4 | 77 |
| 5 | 679 |
| 6 | 6788 |
| 7 | 68889 |
| 8 | 2677889 |
| 9 | 26888999 |
| 10 | 3778888999 |
| 11 | 267777777889999 |
| 12 | 77777777788888888888899999 |
| 13 | 37777777777777777777777777778888889999999999999999999 |