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 | 191 |
| 2 | 919 |
| 3 | 19991 |
| 4 | 1993991 |
| 5 | 9199919 |
| 6 | 199909991 |
| 7 | 199999991 |
| 8 | 90999599909 |
| 9 | 95999999959 |
| 10 | 99999199999 |
| 11 | 9599999999959 |
| 12 | 199999959999991 |
| 13 | 959999999999959 |
| 14 | 39999999299999993 |
| 15 | 94999999999999949 |
| 16 | 99999999299999999 |
| 17 | 9299999999999999929 |
| 18 | 9999999992999999999 |