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 | -11 |
| 2 | 347 |
| 3 | -1155 |
| 4 | 163327 |
| 5 | -96635 |
| 6 | 17032397 |
| 7 | -6549235 |
| 8 | 784694767 |
| 9 | -419591403 |
| 10 | 108429726985 |
| 11 | -24052472675 |
| 12 | 242324521120837 |
| 13 | -1643058393691 |
| 14 | 43438648332779 |
| 15 | -12094439262675 |
| 16 | -204985018983432001 |
| 17 | -35073125915095499 |
| 18 | 292756141289323912199 |
| 19 | 16692076996242949565 |