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 | -2 |
| 2 | 5 |
| 3 | -22 |
| 4 | 293 |
| 5 | -2711 |
| 6 | 65947 |
| 7 | -25351 |
| 8 | 4787053 |
| 9 | -36179867 |
| 10 | 1934943511 |
| 11 | -30066910943 |
| 12 | 68657648659 |
| 13 | -49704534392927 |
| 14 | 2888323549541951 |
| 15 | -405291453396983779 |
| 16 | 5739056879585221501 |
| 17 | -71739598482043345121 |