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 | 12 |
| 2 | -98 |
| 3 | -6984 |
| 4 | -12660 |
| 5 | 6608592 |
| 6 | 94621704 |
| 7 | -8460215136 |
| 8 | -261811748208 |
| 9 | 13237235524800 |
| 10 | 729072813894624 |
| 11 | -23285236203280512 |
| 12 | -2220214665026855232 |
| 13 | 40977749954004344064 |
| 14 | 7476528335622538688640 |
| 15 | -49114276816696253425152 |
| 16 | -27729169180110170480865024 |