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 | -10 |
| 2 | -75 |
| 3 | -1000 |
| 4 | -16250 |
| 5 | -292500 |
| 6 | -5606250 |
| 7 | -112125000 |
| 8 | -2312578125 |
| 9 | -48821093750 |
| 10 | -1049653515625 |
| 11 | -22901531250000 |
| 12 | -505742148437500 |
| 13 | -11281940234375000 |
| 14 | -253843655273437500 |
| 15 | -5753789519531250000 |