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 | 0 |
| 4 | 0 |
| 5 | 8 |
| 6 | 16 |
| 7 | 48 |
| 8 | 96 |
| 9 | 192 |
| 10 | 384 |
| 11 | 768 |
| 12 | 1536 |
| 13 | 4352 |
| 14 | 8704 |
| 15 | 17408 |
| 16 | 34816 |
| 17 | 69632 |
| 18 | 139264 |
| 19 | 339968 |
| 20 | 679936 |
| 21 | 1359872 |
| 22 | 2719744 |
| 23 | 5439488 |
| 24 | 10878976 |
| 25 | 21757952 |
| 26 | 43515904 |
| 27 | 87031808 |
| 28 | 174063616 |
| 29 | 348127232 |
| 30 | 696254464 |
| 31 | 1581252608 |