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 | 0 |
| 2 | -3 |
| 3 | -16 |
| 4 | -104 |
| 5 | -908 |
| 6 | -9980 |
| 7 | -130756 |
| 8 | -1978044 |
| 9 | -33864628 |
| 10 | -646882700 |
| 11 | -13637768276 |
| 12 | -314550050684 |
| 13 | -7879500818548 |
| 14 | -213050486593260 |
| 15 | -6184793428783156 |
| 16 | -191870459680722524 |
| 17 | -6335136849263878868 |
| 18 | -221817478808912340620 |
| 19 | -8209644712019737332436 |