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 | 2 |
| 2 | -16 |
| 3 | -3584 |
| 4 | -1114112 |
| 5 | -771751936 |
| 6 | -68719476736 |
| 7 | 50102545854496768 |
| 8 | 4999067643975288487936 |
| 9 | 1104958199127771065681444864 |
| 10 | 363815722265501838229553819942912 |