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 | -13 |
| 3 | 401 |
| 4 | -68323 |
| 5 | 2067169 |
| 6 | -91473331 |
| 7 | 250738892357 |
| 8 | -12072244190753 |
| 9 | 105796895635531 |
| 10 | -29605311573467996893 |
| 11 | 9784971385947359480303 |
| 12 | -5408317625058335310276319 |
| 13 | 2111561851139130085557412009 |