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 | -4 |
| 2 | -16 |
| 3 | -48 |
| 4 | -384 |
| 5 | -2816 |
| 6 | -24384 |
| 7 | -206336 |
| 8 | -1815552 |
| 9 | -16189440 |
| 10 | -146777856 |
| 11 | -1346648064 |
| 12 | -12487131136 |
| 13 | -116810932224 |
| 14 | -1101080592384 |
| 15 | -10447586845696 |
| 16 | -99706199973888 |
| 17 | -956400813293568 |
| 18 | -9215587975397376 |
| 19 | -89158545637244928 |
| 20 | -865730439117078528 |
| 21 | -8433936444598677504 |