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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 4 |
| 5 | 12 |
| 6 | 24 |
| 7 | 48 |
| 8 | 96 |
| 9 | 192 |
| 10 | 384 |
| 11 | 640 |
| 12 | 1280 |
| 13 | 1920 |
| 14 | 3840 |
| 15 | 7680 |
| 16 | 15360 |
| 17 | 21504 |
| 18 | 43008 |
| 19 | 57344 |
| 20 | 114688 |
| 21 | 229376 |
| 22 | 458752 |
| 23 | 589824 |
| 24 | 1179648 |
| 25 | 2359296 |
| 26 | 4718592 |
| 27 | 9437184 |
| 28 | 18874368 |
| 29 | 23592960 |
| 30 | 47185920 |
| 31 | 57671680 |
| 32 | 115343360 |
| 33 | 230686720 |