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 | 7 |
| 3 | 11 |
| 4 | 13 |
| 5 | 49 |
| 6 | 77 |
| 7 | 91 |
| 8 | 137 |
| 9 | 511 |
| 10 | 959 |
| 11 | 9091 |
| 12 | 69307 |
| 13 | 909091 |
| 14 | 5882353 |
| 15 | 10989011 |
| 16 | 12987013 |
| 17 | 28340081 |
| 18 | 33492823 |
| 19 | 48951049 |
| 20 | 52631579 |
| 21 | 76923077 |
| 22 | 90909091 |
| 23 | 693069307 |
| 24 | 2766798419 |
| 25 | 4347826087 |
| 26 | 5785123967 |
| 27 | 9090909091 |
| 28 | 13698630137 |
| 29 | 51094890511 |
| 30 | 95890410959 |
| 31 | 909090909091 |