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 | -16 |
| 2 | 104 |
| 3 | -320 |
| 4 | 260 |
| 5 | 1248 |
| 6 | -3712 |
| 7 | 1664 |
| 8 | 6890 |
| 9 | -7280 |
| 10 | -5568 |
| 11 | -4160 |
| 12 | 33176 |
| 13 | 4640 |
| 14 | -74240 |
| 15 | 29824 |
| 16 | 14035 |
| 17 | 54288 |
| 18 | 27040 |
| 19 | -142720 |
| 20 | 1508 |
| 21 | -110240 |
| 22 | 289536 |
| 23 | 222720 |
| 24 | -380770 |
| 25 | -83200 |
| 26 | -123904 |
| 27 | 142912 |
| 28 | 7640 |
| 29 | 408000 |
| 30 | 386048 |