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) |
|---|---|
| 1 | 1 |
| 2 | -6 |
| 3 | -20 |
| 4 | 8 |
| 5 | 176 |
| 6 | 288 |
| 7 | -832 |
| 8 | -3968 |
| 9 | -1280 |
| 10 | 29184 |
| 11 | 68608 |
| 12 | -96256 |
| 13 | -741376 |
| 14 | -712704 |
| 15 | 4505600 |
| 16 | 14712832 |
| 17 | -6619136 |
| 18 | -130940928 |
| 19 | -208928768 |
| 20 | 629669888 |
| 21 | 2930769920 |
| 22 | 824180736 |
| 23 | -21797797888 |
| 24 | -50189041664 |
| 25 | 74004299776 |
| 26 | 549520932864 |