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 | 0 |
| 2 | -253 |
| 3 | -1288 |
| 4 | 191521 |
| 5 | 1629320 |
| 6 | -141854525 |
| 7 | -1729034384 |
| 8 | 103325091969 |
| 9 | 1676517701264 |
| 10 | -73862084838333 |
| 11 | -1537330036703384 |
| 12 | 51664189190888737 |
| 13 | 1355829753195189272 |
| 14 | -35196896202269431421 |
| 15 | -1160994902209537876768 |
| 16 | 23182613727557891170817 |
| 17 | 970833262148740191853344 |