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 | 3 |
| 2 | -36 |
| 3 | 6201 |
| 4 | -10519740 |
| 5 | 168009075234 |
| 6 | -24937507748845692 |
| 7 | 34147337933260567913832 |
| 8 | -429040882807948915054596365580 |
| 9 | 49262806958277650055073574841789707655 |