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 | 12 |
| 2 | -914 |
| 3 | -36360 |
| 4 | 2464716 |
| 5 | 183452112 |
| 6 | -10836922296 |
| 7 | -1294597074528 |
| 8 | 64723081629840 |
| 9 | 11734146618363072 |
| 10 | -475483423858979616 |
| 11 | -129853072308589057152 |
| 12 | 3975439219167736085184 |
| 13 | 1696319876659859502624000 |
| 14 | -34322352500514728084132736 |
| 15 | -25537758243092015689876280832 |