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 | 3 |
| 3 | 5 |
| 4 | 124 |
| 5 | -2075 |
| 6 | 91993 |
| 7 | -4709903 |
| 8 | 312334595 |
| 9 | -25531783799 |
| 10 | 2524083665172 |
| 11 | -296260739274275 |
| 12 | 40667620527027177 |
| 13 | -6446882734412545043 |
| 14 | 1167717545574222779643 |
| 15 | -239452569059443831797303 |
| 16 | 55146244227862697483251020 |
| 17 | -14163492441645773105212592623 |