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 | 50 |
| 2 | 578 |
| 3 | -163300 |
| 4 | -11497748 |
| 5 | 680563000 |
| 6 | 144521508280 |
| 7 | -622177102000 |
| 8 | -1975501227499120 |
| 9 | -89208466254604000 |
| 10 | 29711796920549577760 |
| 11 | 3200176567440967768000 |
| 12 | -468157982122210784601920 |
| 13 | -97216771457569019831248000 |
| 14 | 6836556768427107672501173120 |