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 | 7 |
| 3 | -8 |
| 4 | -827 |
| 5 | 2896 |
| 6 | 452179 |
| 7 | -2511872 |
| 8 | -560237303 |
| 9 | 4254259456 |
| 10 | 1237434920191 |
| 11 | -11907540107264 |
| 12 | -4275828959720435 |
| 13 | 49800209789734912 |
| 14 | 21288959122755516235 |
| 15 | -290981680034059649024 |
| 16 | -144324916601232035246831 |
| 17 | 2264121148389579474141184 |