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 | 1 |
| 2 | -23 |
| 3 | 181 |
| 4 | 1121 |
| 5 | -52089 |
| 6 | 626173 |
| 7 | 5316347 |
| 8 | -399803119 |
| 9 | 7620588298 |
| 10 | 31902679531 |
| 11 | -6557359308608 |
| 12 | 194900912785645 |
| 13 | -848401708653776 |
| 14 | -174604839643773881 |
| 15 | 8176828021495305286 |
| 16 | -126623050856603702831 |
| 17 | -5957027100954823834447 |