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 | -744 |
| 2 | 159768 |
| 3 | -36866976 |
| 4 | 8507424792 |
| 5 | -1963211493744 |
| 6 | 453039686271072 |
| 7 | -104545516658693952 |
| 8 | 24125403112135458840 |
| 9 | -5567288717204029449672 |
| 10 | 1284733088879405339418768 |
| 11 | -296470902355240575283208928 |
| 12 | 68414985730612787485819011168 |