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 | 52 |
| 2 | 1246 |
| 3 | -86840 |
| 4 | -9965684 |
| 5 | -11764688 |
| 6 | 72038072584 |
| 7 | 3848897264992 |
| 8 | -535077911012720 |
| 9 | -72717589071528128 |
| 10 | 3239977716589449184 |
| 11 | 1228701289925531463808 |
| 12 | 11929704457466050105024 |
| 13 | -20877013136748863885323520 |
| 14 | -1311720301397752435727447936 |