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 | -44 |
| 2 | 902 |
| 3 | -11352 |
| 4 | 96965 |
| 5 | -582692 |
| 6 | 2428382 |
| 7 | -6245448 |
| 8 | 3684670 |
| 9 | 43828180 |
| 10 | -195750104 |
| 11 | 340202584 |
| 12 | 211248851 |
| 13 | -2418539816 |
| 14 | 4734800950 |
| 15 | -43313600 |
| 16 | -16560186918 |
| 17 | 26632794760 |
| 18 | 4021681554 |
| 19 | -50231748600 |
| 20 | 12519655368 |