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 | 1 |
| 2 | 1 |
| 3 | -9 |
| 4 | -90 |
| 5 | -1539 |
| 6 | 51759 |
| 7 | 7026831 |
| 8 | 1349328699 |
| 9 | -119669884380 |
| 10 | -462804380329131 |
| 11 | -818173230956710191 |
| 12 | -775566981773559330471 |
| 13 | 23349606875054800260574779 |
| 14 | 383206716517298992863985977570 |