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 | 8 |
| 2 | 0 |
| 3 | -256 |
| 4 | 2048 |
| 5 | 8192 |
| 6 | -327680 |
| 7 | 2097152 |
| 8 | 27262976 |
| 9 | -612368384 |
| 10 | 2013265920 |
| 11 | 82409684992 |
| 12 | -1249835483136 |
| 13 | -996432412672 |
| 14 | 239418656948224 |
| 15 | -2495891395051520 |
| 16 | -17018240974716928 |
| 17 | 669901648478339072 |
| 18 | -4349632815109767168 |
| 19 | -80937285128219000832 |