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 | 16 |
| 2 | -322 |
| 3 | -23648 |
| 4 | 179980 |
| 5 | 57553856 |
| 6 | 400719496 |
| 7 | -193185260672 |
| 8 | -4712275251568 |
| 9 | 817892241322240 |
| 10 | 37599531719812576 |
| 11 | -4125824647325545984 |
| 12 | -305071017031777093952 |
| 13 | 23735583481341553441792 |
| 14 | 2672072957678237939024000 |
| 15 | -149315174208164043426596864 |