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 | -8 |
| 2 | -20 |
| 3 | -24 |
| 4 | 144 |
| 5 | -384 |
| 6 | -832 |
| 7 | -896 |
| 8 | 4352 |
| 9 | -10240 |
| 10 | -21504 |
| 11 | -22528 |
| 12 | 102400 |
| 13 | -229376 |
| 14 | -475136 |
| 15 | -491520 |
| 16 | 2162688 |
| 17 | -4718592 |
| 18 | -9699328 |
| 19 | -9961472 |
| 20 | 42991616 |
| 21 | -92274688 |
| 22 | -188743680 |
| 23 | -192937984 |
| 24 | 822083584 |
| 25 | -1744830464 |
| 26 | -3556769792 |