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 | -434 |
| 3 | -5336 |
| 4 | 564556 |
| 5 | 11863024 |
| 6 | -1222798904 |
| 7 | -36921360416 |
| 8 | 3704131105936 |
| 9 | 147733421921344 |
| 10 | -14410797291355424 |
| 11 | -722443587811469696 |
| 12 | 68443672240963470016 |
| 13 | 4174970063145790238464 |
| 14 | -383695602357053138639744 |
| 15 | -27837093807246691056882176 |
| 16 | 2478596940681121921590743296 |