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 | -2 |
| 2 | 14 |
| 3 | -170 |
| 4 | 2910 |
| 5 | -64202 |
| 6 | 1733278 |
| 7 | -55338250 |
| 8 | 2039421598 |
| 9 | -85204516298 |
| 10 | 3979272245662 |
| 11 | -205432301027978 |
| 12 | 11616783053131934 |
| 13 | -714082744228546890 |
| 14 | 47409028234931260318 |
| 15 | -3380871137079666543114 |
| 16 | 257736986308003127354014 |