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 | 7 |
| 2 | -64 |
| 3 | -1675 |
| 4 | -12288 |
| 5 | -45357 |
| 6 | -17792 |
| 7 | 1273609 |
| 8 | 14680064 |
| 9 | 129434759 |
| 10 | 1063741824 |
| 11 | 8570447421 |
| 12 | 68683644928 |
| 13 | 549693065371 |
| 14 | 4397941097600 |
| 15 | 35184201229457 |
| 16 | 281474708275200 |
| 17 | 2251799403346575 |
| 18 | 18014397897261952 |