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 | 18 |
| 2 | -1358 |
| 3 | -84996 |
| 4 | 5322540 |
| 5 | 667658808 |
| 6 | -32744702856 |
| 7 | -7327417341744 |
| 8 | 253642619275152 |
| 9 | 103163294897460000 |
| 10 | -1982702662432970976 |
| 11 | -1770895268099070677568 |
| 12 | 4807849834551556801728 |
| 13 | 35830291388333570578463616 |
| 14 | 539816800507699929385760640 |