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) |
|---|---|
| 1 | 4 |
| 2 | -14 |
| 3 | -196 |
| 4 | 480 |
| 5 | 696 |
| 6 | -57901 |
| 7 | -525364 |
| 8 | -409579 |
| 9 | 18528507 |
| 10 | -237549252 |
| 11 | -2119519900 |
| 12 | 6713972874 |
| 13 | 18262155072 |
| 14 | -19072020914992 |
| 15 | 162234208372185 |
| 16 | 1471912942112734 |
| 17 | 6828673030820538 |
| 18 | -35126752028893500 |
| 19 | 729026655790306778 |
| 20 | -15365360727898374618 |