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 | -6 |
| 3 | -154 |
| 4 | -1610 |
| 5 | -34588 |
| 6 | -4666292 |
| 7 | -553625626 |
| 8 | -1158735422 |
| 9 | -388434091184 |
| 10 | -31268175015478 |
| 11 | -2796356409576766 |
| 12 | -4624948938397276052 |
| 13 | -1691272281281652408568 |
| 14 | -2154089954877183990112 |
| 15 | -170222948041126582837968646 |
| 16 | -5761785676811885455064909606 |
| 17 | -55629298859254851627617870836 |