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 | -1008 |
| 2 | 8304 |
| 3 | -28224 |
| 4 | 66672 |
| 5 | -127008 |
| 6 | 232512 |
| 7 | -346752 |
| 8 | 533616 |
| 9 | -763056 |
| 10 | 1046304 |
| 11 | -1342656 |
| 12 | 1866816 |
| 13 | -2215584 |
| 14 | 2856576 |
| 15 | -3556224 |
| 16 | 4269168 |
| 17 | -4953312 |
| 18 | 6286128 |
| 19 | -6914880 |
| 20 | 8400672 |
| 21 | -9709056 |
| 22 | 11060928 |
| 23 | -12265344 |
| 24 | 14941248 |
| 25 | -15877008 |
| 26 | 18252192 |
| 27 | -20603520 |
| 28 | 22935168 |
| 29 | -24585120 |