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 | -1 |
| 2 | -128 |
| 3 | -2059 |
| 4 | -6069 |
| 5 | 210067 |
| 6 | 3664420 |
| 7 | 23366098 |
| 8 | -116899962 |
| 9 | -4133365357 |
| 10 | -41809923367 |
| 11 | -125160180169 |
| 12 | 2447495850838 |
| 13 | 42931762306584 |
| 14 | 321967686614676 |
| 15 | 281683012498569 |
| 16 | -23874414003295851 |
| 17 | -318729240693402530 |
| 18 | -1992572289343189863 |