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 | 11 |
| 2 | 11 |
| 3 | 57 |
| 4 | 57 |
| 5 | 1191 |
| 6 | 1191 |
| 7 | 247 |
| 8 | 4293 |
| 9 | 15619 |
| 10 | 15619 |
| 11 | 4293 |
| 12 | 247 |
| 13 | 1013 |
| 14 | 1013 |
| 15 | 152637 |
| 16 | 152637 |
| 17 | 4083 |
| 18 | 478271 |
| 19 | 10187685 |
| 20 | 10187685 |
| 21 | 478271 |
| 22 | 4083 |
| 23 | 423281535 |
| 24 | 423281535 |
| 25 | 16369 |
| 26 | 2571742175 |
| 27 | 12843262863 |
| 28 | 12843262863 |
| 29 | 2571742175 |
| 30 | 16369 |
| 31 | 13824739 |