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 | -18 |
| 2 | -108 |
| 3 | -936 |
| 4 | -13194 |
| 5 | -224424 |
| 6 | -4218264 |
| 7 | -84318336 |
| 8 | -1759467636 |
| 9 | -37903487130 |
| 10 | -836893437912 |
| 11 | -18844318997496 |
| 12 | -431163494289720 |
| 13 | -9997357777073064 |
| 14 | -234430475682110256 |
| 15 | -5550426839122171776 |
| 16 | -132513976699508759994 |