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 | 34 |
| 2 | -526 |
| 3 | -132260 |
| 4 | -1842644 |
| 5 | 827195384 |
| 6 | 43621279096 |
| 7 | -6864932326064 |
| 8 | -747004639162480 |
| 9 | 66976371647992864 |
| 10 | 13585352863673379616 |
| 11 | -664640573754345065536 |
| 12 | -273953978191332601883456 |
| 13 | 4100670082152392338741120 |
| 14 | 6129700469924860012300846976 |