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 | -16 |
| 3 | -713 |
| 4 | -64711 |
| 5 | -9688521 |
| 6 | -2165724176 |
| 7 | -675843638952 |
| 8 | -280752881225790 |
| 9 | -149800127712465769 |
| 10 | -99844730464906330029 |
| 11 | -81300082264515781043363 |
| 12 | -79413710307214816810372248 |
| 13 | -91652445696245266803423194130 |