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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 5 |
| 6 | 170 |
| 7 | 4095 |
| 8 | 4097 |
| 9 | 8194 |
| 10 | 12291 |
| 11 | 20485 |
| 12 | 21845 |
| 13 | 696490 |
| 14 | 699050 |
| 15 | 16777215 |
| 16 | 16777217 |
| 17 | 16781313 |
| 18 | 16785409 |
| 19 | 16789505 |
| 20 | 33554434 |
| 21 | 33558530 |
| 22 | 33562626 |
| 23 | 33566722 |
| 24 | 50331651 |
| 25 | 50335747 |
| 26 | 50339843 |
| 27 | 50343939 |
| 28 | 83886085 |
| 29 | 83906565 |
| 30 | 89458005 |
| 31 | 89478485 |