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 | 0 |
| 3 | -24 |
| 4 | -24 |
| 5 | 252 |
| 6 | 552 |
| 7 | -1196 |
| 8 | -5496 |
| 9 | -1218 |
| 10 | 27808 |
| 11 | 50532 |
| 12 | -44136 |
| 13 | -286534 |
| 14 | -305256 |
| 15 | 551724 |
| 16 | 2023976 |
| 17 | 1639485 |
| 18 | -3659784 |
| 19 | -11484752 |
| 20 | -9396720 |
| 21 | 16258722 |
| 22 | 55073200 |
| 23 | 55004040 |
| 24 | -44731872 |
| 25 | -220443155 |
| 26 | -289179552 |
| 27 | 5590128 |
| 28 | 691963304 |
| 29 | 1254552228 |
| 30 | 741227832 |
| 31 | -1414045956 |