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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 32 |
| 6 | 64 |
| 7 | 128 |
| 8 | 256 |
| 9 | 512 |
| 10 | 1024 |
| 11 | 2047 |
| 12 | 4091 |
| 13 | 8175 |
| 14 | 16335 |
| 15 | 32639 |
| 16 | 65215 |
| 17 | 130303 |
| 18 | 260351 |
| 19 | 520191 |
| 20 | 1039359 |
| 21 | 2076672 |
| 22 | 4149254 |
| 23 | 8290334 |
| 24 | 16564334 |
| 25 | 33096030 |
| 26 | 66126846 |
| 27 | 132123390 |
| 28 | 263986430 |
| 29 | 527452670 |
| 30 | 1053865982 |
| 31 | 2105655293 |
| 32 | 4207161333 |
| 33 | 8406032333 |