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 | 2 |
| 1 | 0 |
| 2 | -8 |
| 3 | -24 |
| 4 | -72 |
| 5 | -240 |
| 6 | -896 |
| 7 | -3640 |
| 8 | -15688 |
| 9 | -70512 |
| 10 | -326968 |
| 11 | -1553288 |
| 12 | -7523520 |
| 13 | -37026704 |
| 14 | -184677536 |
| 15 | -931655064 |
| 16 | -4746324296 |
| 17 | -24387839056 |
| 18 | -126257024696 |
| 19 | -658011767016 |
| 20 | -3449826712952 |
| 21 | -18183760406080 |
| 22 | -96309365029424 |
| 23 | -512340286827272 |