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 | 22 |
| 2 | -398 |
| 3 | -47564 |
| 4 | 6700 |
| 5 | 167953192 |
| 6 | 3665423224 |
| 7 | -808168981136 |
| 8 | -40410040569968 |
| 9 | 4813419438356320 |
| 10 | 426670129688245024 |
| 11 | -33067616593161351872 |
| 12 | -4867041163284902964032 |
| 13 | 242912748429751883004544 |
| 14 | 61149574443679238811690880 |
| 15 | -1654195979849632997482909952 |