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 | 1 |
| 2 | -3 |
| 3 | -30 |
| 4 | -256 |
| 5 | -7595 |
| 6 | -358301 |
| 7 | -7665804 |
| 8 | -227965955 |
| 9 | -13089461984 |
| 10 | -2467071630448 |