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 | 31 |
| 2 | 127 |
| 3 | 287 |
| 4 | 511 |
| 5 | 799 |
| 6 | 1151 |
| 7 | 1567 |
| 8 | 2047 |
| 9 | 2591 |
| 10 | 3199 |
| 11 | 3871 |
| 12 | 4607 |
| 13 | 5407 |
| 14 | 6271 |
| 15 | 7199 |
| 16 | 8191 |
| 17 | 9247 |
| 18 | 10367 |
| 19 | 11551 |
| 20 | 12799 |
| 21 | 14111 |
| 22 | 15487 |
| 23 | 16927 |
| 24 | 18431 |
| 25 | 19999 |
| 26 | 21631 |
| 27 | 23327 |
| 28 | 25087 |
| 29 | 26911 |
| 30 | 28799 |
| 31 | 30751 |
| 32 | 32767 |
| 33 | 34847 |
| 34 | 36991 |
| 35 | 39199 |
| 36 | 41471 |
| 37 | 43807 |
| 38 | 46207 |
| 39 | 48671 |
| 40 | 51199 |
| 41 | 53791 |