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 | 2 |
| 2 | -878 |
| 3 | -5284 |
| 4 | 2312620 |
| 5 | 23267192 |
| 6 | -10152119816 |
| 7 | -143434219696 |
| 8 | 62392319304592 |
| 9 | 1136856492784160 |
| 10 | -492996517654282976 |
| 11 | -11013067301664857152 |
| 12 | 4761026079678523718848 |
| 13 | 126084356480177895534464 |
| 14 | -54337756316633597169242240 |
| 15 | -1665565146450503848398045952 |