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 | -3 |
| 2 | -3 |
| 3 | 69 |
| 4 | 285 |
| 5 | -6123 |
| 6 | -56883 |
| 7 | 1103109 |
| 8 | 19251645 |
| 9 | -320851083 |
| 10 | -9828858963 |
| 11 | 130009042149 |
| 12 | 7019067151005 |
| 13 | -62927791491243 |
| 14 | -6646083378845043 |
| 15 | 24719268064533189 |
| 16 | 8013257547754474365 |
| 17 | 22024516916447897397 |