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 | -5 |
| 2 | -175 |
| 3 | -3250 |
| 4 | -100625 |
| 5 | -1015000 |
| 6 | -58034375 |
| 7 | -154171875 |
| 8 | -22257500000 |
| 9 | -154144921875 |
| 10 | -6824828906250 |
| 11 | 175448177734375 |
| 12 | -8774446542968750 |
| 13 | 164769756689453125 |
| 14 | 756859169189453125 |
| 15 | 9661555852294921875 |
| 16 | -16148589271240234375 |
| 17 | 81663068586871337890625 |