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 | -168 |
| 2 | -33768 |
| 3 | -9806496 |
| 4 | -3482370024 |
| 5 | -1364023149552 |
| 6 | -567278132268960 |
| 7 | -245678241438057792 |
| 8 | -109559333350138970088 |
| 9 | -49951945835561166375048 |
| 10 | -23173552482577051154061168 |
| 11 | -10901813191731667585777068000 |