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 | 7 |
| 2 | 14 |
| 3 | 28 |
| 4 | 56 |
| 5 | 112 |
| 6 | 224 |
| 7 | 448 |
| 8 | 896 |
| 9 | 1792 |
| 10 | 3584 |
| 11 | 7168 |
| 12 | 14336 |
| 13 | 28672 |
| 14 | 57344 |
| 15 | 114688 |
| 16 | 229376 |
| 17 | 458752 |
| 18 | 917504 |
| 19 | 1835008 |
| 20 | 3670016 |
| 21 | 7340032 |
| 22 | 14680064 |
| 23 | 29360128 |
| 24 | 58720256 |
| 25 | 117440512 |
| 26 | 234881024 |
| 27 | 469762048 |
| 28 | 939524096 |
| 29 | 1879048192 |
| 30 | 3758096384 |
| 31 | 7516192768 |
| 32 | 15032385536 |