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 | -16 |
| 3 | 200 |
| 4 | -3006 |
| 5 | 49956 |
| 6 | -884352 |
| 7 | 16349648 |
| 8 | -311986480 |
| 9 | 6098614912 |
| 10 | -121497078016 |
| 11 | 2457844837376 |
| 12 | -50353474318552 |
| 13 | 1042571366405520 |
| 14 | -21781950163497216 |
| 15 | 458626034728146240 |
| 16 | -9721961867347898174 |