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 | 7 |
| 3 | 31 |
| 4 | 73 |
| 5 | 127 |
| 6 | 443 |
| 7 | 1453 |
| 8 | 5981 |
| 9 | 8191 |
| 10 | 19609 |
| 11 | 21157 |
| 12 | 28123 |
| 13 | 29671 |
| 14 | 83269 |
| 15 | 131071 |
| 16 | 262657 |
| 17 | 287281 |
| 18 | 324217 |
| 19 | 354997 |
| 20 | 367309 |
| 21 | 431947 |
| 22 | 456571 |
| 23 | 462727 |
| 24 | 499663 |
| 25 | 524287 |
| 26 | 1348901 |
| 27 | 1488301 |
| 28 | 1715851 |
| 29 | 1875751 |
| 30 | 5548693 |
| 31 | 6298627 |
| 32 | 7331323 |
| 33 | 7355911 |
| 34 | 8093551 |
| 35 | 8191903 |