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 | 1024 |
| 3 | 2049 |
| 4 | 4099 |
| 5 | 8199 |
| 6 | 16399 |
| 7 | 32799 |
| 8 | 65599 |
| 9 | 131199 |
| 10 | 262399 |
| 11 | 524799 |
| 12 | 1049599 |
| 13 | 2097152 |
| 14 | 2099199 |
| 15 | 4194305 |
| 16 | 4196352 |
| 17 | 4198399 |
| 18 | 8388611 |
| 19 | 8392705 |
| 20 | 8394752 |
| 21 | 8396799 |
| 22 | 16777223 |
| 23 | 16785411 |
| 24 | 16789505 |
| 25 | 16791552 |
| 26 | 16793599 |
| 27 | 33554447 |
| 28 | 33570823 |
| 29 | 33579011 |
| 30 | 33583105 |
| 31 | 33585152 |
| 32 | 33587199 |
| 33 | 67108895 |
| 34 | 67141647 |
| 35 | 67158023 |
| 36 | 67166211 |
| 37 | 67170305 |