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) |
|---|---|
| 2 | -2 |
| 3 | -14 |
| 4 | 70 |
| 5 | 910 |
| 6 | -7280 |
| 7 | -138320 |
| 8 | 1521520 |
| 9 | 38038000 |
| 10 | -532532000 |