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 | 8 |
| 2 | -34 |
| 3 | 136 |
| 4 | -530 |
| 5 | 2032 |
| 6 | -7714 |
| 7 | 29104 |
| 8 | -109378 |
| 9 | 410040 |
| 10 | -1534722 |
| 11 | 5738360 |
| 12 | -21441682 |
| 13 | 80083808 |
| 14 | -299027394 |
| 15 | 1116348896 |
| 16 | -4167148290 |
| 17 | 15554127592 |
| 18 | -58053908834 |
| 19 | 216672484584 |
| 20 | -808662529938 |
| 21 | 3018041612880 |
| 22 | -11263658377442 |
| 23 | 42036964786320 |
| 24 | -156885101002562 |