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 | 1111 |
| 2 | 11088011 |
| 3 | 16169191 |
| 4 | 101808101 |
| 5 | 616101919 |
| 6 | 668808899 |
| 7 | 686808989 |
| 8 | 1016969101 |
| 9 | 1106699011 |
| 10 | 1199006611 |
| 11 | 6068888909 |
| 12 | 6699116699 |
| 13 | 6699886699 |
| 14 | 11990006611 |
| 15 | 16168089191 |
| 16 | 19190006161 |
| 17 | 19198086161 |
| 18 | 66110001199 |
| 19 | 66880008899 |
| 20 | 110668899011 |
| 21 | 161600009191 |