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 | 7 |
| 1 | 15 |
| 2 | 32 |
| 3 | 68 |
| 4 | 144 |
| 5 | 304 |
| 6 | 640 |
| 7 | 1344 |
| 8 | 2816 |
| 9 | 5888 |
| 10 | 12288 |
| 11 | 25600 |
| 12 | 53248 |
| 13 | 110592 |
| 14 | 229376 |
| 15 | 475136 |
| 16 | 983040 |
| 17 | 2031616 |
| 18 | 4194304 |
| 19 | 8650752 |
| 20 | 17825792 |
| 21 | 36700160 |
| 22 | 75497472 |
| 23 | 155189248 |
| 24 | 318767104 |
| 25 | 654311424 |
| 26 | 1342177280 |
| 27 | 2751463424 |
| 28 | 5637144576 |