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 | 6 |
| 2 | -1646 |
| 3 | -30060 |
| 4 | 8125356 |
| 5 | 250995816 |
| 6 | -66828269064 |
| 7 | -2934019389456 |
| 8 | 769231923622800 |
| 9 | 44095556446256736 |
| 10 | -11380059521124405984 |
| 11 | -809967616552784735424 |
| 12 | 205694055560527051103424 |
| 13 | 17582550705864569406418560 |
| 14 | -4392210914651297082988957824 |