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 | 127 |
| 2 | 1093 |
| 3 | 2801 |
| 4 | 19531 |
| 5 | 22621 |
| 6 | 30941 |
| 7 | 55987 |
| 8 | 88741 |
| 9 | 131071 |
| 10 | 245411 |
| 11 | 292561 |
| 12 | 346201 |
| 13 | 524287 |
| 14 | 637421 |
| 15 | 732541 |
| 16 | 797161 |
| 17 | 837931 |
| 18 | 2625641 |
| 19 | 3500201 |
| 20 | 3835261 |
| 21 | 5229043 |
| 22 | 6377551 |
| 23 | 8108731 |
| 24 | 12207031 |
| 25 | 15018571 |
| 26 | 16007041 |
| 27 | 21700501 |
| 28 | 25646167 |
| 29 | 28792661 |
| 30 | 30397351 |
| 31 | 35615581 |