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 | 0 |
| 1 | 4 |
| 2 | 12 |
| 3 | 24 |
| 4 | 48 |
| 5 | 80 |
| 6 | 168 |
| 7 | 280 |
| 8 | 576 |
| 9 | 1080 |
| 10 | 2160 |
| 11 | 4136 |
| 12 | 8448 |
| 13 | 16432 |
| 14 | 33096 |
| 15 | 65760 |
| 16 | 131712 |
| 17 | 262208 |
| 18 | 525672 |
| 19 | 1048648 |
| 20 | 2099520 |
| 21 | 4194960 |
| 22 | 8392824 |
| 23 | 16777304 |
| 24 | 33564096 |
| 25 | 67109200 |
| 26 | 134234256 |
| 27 | 268437672 |
| 28 | 536904480 |
| 29 | 1073741936 |
| 30 | 2147554080 |
| 31 | 4294967416 |
| 32 | 8590066944 |