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) |
|---|---|
| 1 | 0 |
| 2 | 756 |
| 3 | 4032 |
| 4 | -265734 |
| 5 | -2987712 |
| 6 | 120604680 |
| 7 | 2176735680 |
| 8 | -58263976134 |
| 9 | -1563340453248 |
| 10 | 27722120100948 |
| 11 | 1105815958027200 |
| 12 | -12029301541618956 |
| 13 | -769283790627284352 |
| 14 | 3952625120472002580 |
| 15 | 525306588856752370752 |
| 16 | 41570815360527775098 |
| 17 | -351118365555207656907648 |