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 | 24 |
| 2 | -146 |
| 3 | -38160 |
| 4 | -599604 |
| 5 | 95815584 |
| 6 | 4464144456 |
| 7 | -307933642944 |
| 8 | -29952193511280 |
| 9 | 1059772077373824 |
| 10 | 220063883293269216 |
| 11 | -2370021199600548096 |
| 12 | -1804627869905557267776 |
| 13 | -22777205204394225722880 |
| 14 | 16391584262028099097996416 |
| 15 | 623630012494691211958785024 |