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 | 3 |
| 2 | 11 |
| 3 | 37 |
| 4 | 101 |
| 5 | 271 |
| 6 | 13 |
| 7 | 4649 |
| 8 | 137 |
| 9 | 333667 |
| 10 | 9091 |
| 11 | 513239 |
| 12 | 9901 |
| 13 | 265371653 |
| 14 | 909091 |
| 15 | 2906161 |
| 16 | 5882353 |
| 17 | 5363222357 |
| 18 | 52579 |
| 19 | 1111111111111111111 |
| 20 | 27961 |
| 21 | 10838689 |
| 22 | 8779 |
| 23 | 11111111111111111111111 |
| 24 | 99990001 |
| 25 | 182521213001 |
| 26 | 1058313049 |
| 27 | 440334654777631 |
| 28 | 121499449 |
| 29 | 77843839397 |