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 | -5 |
| 3 | -191 |
| 4 | 40915 |
| 5 | 53110057 |
| 6 | -412878084725 |
| 7 | -19264066381851695 |
| 8 | 5392667163887921078275 |
| 9 | 9057620836725683164283293369 |
| 10 | -91279931160615494871228103624209605 |