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 | -32 |
| 2 | 432 |
| 3 | -3008 |
| 4 | 9144 |
| 5 | 15040 |
| 6 | -217216 |
| 7 | 535104 |
| 8 | 868252 |
| 9 | -6262496 |
| 10 | 3084192 |
| 11 | 30773568 |
| 12 | -9780096 |
| 13 | -186954304 |
| 14 | -120143680 |
| 15 | 1509279360 |
| 16 | 594179718 |
| 17 | -7348077952 |
| 18 | -5674293872 |
| 19 | 21981855936 |
| 20 | 64543508768 |