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 | 7 |
| 4 | 31 |
| 5 | 63 |
| 6 | 239 |
| 7 | 255 |
| 8 | 511 |
| 9 | 1023 |
| 10 | 3455 |
| 11 | 3887 |
| 12 | 3951 |
| 13 | 3967 |
| 14 | 4095 |
| 15 | 7679 |
| 16 | 7903 |
| 17 | 7935 |
| 18 | 8191 |
| 19 | 16350 |
| 20 | 16351 |
| 21 | 16383 |
| 22 | 32767 |
| 23 | 104063 |
| 24 | 104447 |
| 25 | 106287 |
| 26 | 106351 |
| 27 | 111587 |
| 28 | 111599 |
| 29 | 112511 |
| 30 | 112623 |
| 31 | 112639 |
| 32 | 127791 |
| 33 | 127855 |
| 34 | 127871 |
| 35 | 128879 |
| 36 | 128895 |
| 37 | 129023 |
| 38 | 131071 |
| 39 | 237567 |