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 | 11 |
| 3 | 13 |
| 4 | 77 |
| 5 | 91 |
| 6 | 137 |
| 7 | 9091 |
| 8 | 909091 |
| 9 | 5882353 |
| 10 | 10989011 |
| 11 | 12987013 |
| 12 | 52631579 |
| 13 | 76923077 |
| 14 | 90909091 |
| 15 | 4347826087 |
| 16 | 9090909091 |
| 17 | 13698630137 |
| 18 | 909090909091 |
| 19 | 3448275862069 |
| 20 | 10989010989011 |
| 21 | 12987012987013 |
| 22 | 76923076923077 |
| 23 | 90909090909091 |
| 24 | 9090909090909091 |
| 25 | 909090909090909091 |