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 | 1 |
| 2 | -24 |
| 3 | 252 |
| 4 | -1472 |
| 5 | 4830 |
| 6 | -6048 |
| 7 | -16744 |
| 8 | 84480 |
| 9 | -113643 |
| 10 | -115920 |
| 11 | 534612 |
| 12 | -370944 |
| 13 | -577738 |
| 14 | 401856 |
| 15 | 1217160 |
| 16 | 987136 |
| 17 | -6905934 |
| 18 | 2727432 |
| 19 | 10661420 |
| 20 | -7109760 |
| 21 | -4219488 |
| 22 | -12830688 |
| 23 | 18643272 |
| 24 | 21288960 |
| 25 | -25499225 |
| 26 | 13865712 |
| 27 | -73279080 |
| 28 | 24647168 |