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 | -23 |
| 3 | -1169 |
| 4 | -3215 |
| 5 | 314167 |
| 6 | 3356569 |
| 7 | -112224161 |
| 8 | -2477279903 |
| 9 | 47300157415 |
| 10 | 1936378479049 |
| 11 | -20501463985457 |
| 12 | -1677122003305007 |
| 13 | 5973410860299799 |
| 14 | 1611600071115585145 |
| 15 | 5260002350626898623 |
| 16 | -1703708060350443666239 |
| 17 | -17985479130375292877369 |