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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 16 |
| 5 | 36 |
| 6 | 80 |
| 7 | 176 |
| 8 | 384 |
| 9 | 832 |
| 10 | 1792 |
| 11 | 3840 |
| 12 | 8192 |
| 13 | 17408 |
| 14 | 36864 |
| 15 | 77824 |
| 16 | 163840 |
| 17 | 344064 |
| 18 | 720896 |
| 19 | 1507328 |
| 20 | 3145728 |
| 21 | 6553600 |
| 22 | 13631488 |
| 23 | 28311552 |
| 24 | 58720256 |
| 25 | 121634816 |
| 26 | 251658240 |
| 27 | 520093696 |
| 28 | 1073741824 |
| 29 | 2214592512 |
| 30 | 4563402752 |