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 | 7 |
| 2 | -448 |
| 3 | -19171 |
| 4 | -258048 |
| 5 | -1920357 |
| 6 | -9815552 |
| 7 | -38256455 |
| 8 | -117440512 |
| 9 | -253202761 |
| 10 | 73741824 |
| 11 | 6231986901 |
| 12 | 63559696384 |
| 13 | 539151314515 |
| 14 | 4377385464320 |
| 15 | 35145928729457 |
| 16 | 281406257233920 |
| 17 | 2251681225808751 |