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 | 1 |
| 2 | -2 |
| 3 | 4 |
| 4 | 48 |
| 5 | 192 |
| 6 | -1216 |
| 7 | 4672 |
| 8 | 120704 |
| 9 | 115712 |
| 10 | -1717760 |
| 11 | -4103168 |
| 12 | 10545152 |
| 13 | 8527872 |
| 14 | -520617984 |
| 15 | -8178925568 |
| 16 | 97259454464 |
| 17 | -1335459315712 |
| 18 | -19462172966912 |
| 19 | -360902649708544 |
| 20 | -1350652745744384 |
| 21 | 74944810429972480 |
| 22 | -12488535009247887360 |
| 23 | -107854339949694287872 |
| 24 | 84090212651516146221056 |