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 | -5 |
| 2 | -11 |
| 3 | 415 |
| 4 | 1705 |
| 5 | -120125 |
| 6 | -737891 |
| 7 | 73544935 |
| 8 | 602197585 |
| 9 | -77251102325 |
| 10 | -790660144571 |
| 11 | 123981052932655 |
| 12 | 1522721707926265 |
| 13 | -282190333761783725 |
| 14 | -4043468004740204051 |
| 15 | 864617687280807347575 |
| 16 | 14158848206836206915745 |
| 17 | -3431276846283480837508325 |