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 | 0 |
| 2 | 155 |
| 3 | 3472 |
| 4 | -42780 |
| 5 | -3515648 |
| 6 | -20959596 |
| 7 | 3104332560 |
| 8 | 79077122892 |
| 9 | -1916421007872 |
| 10 | -126126967563156 |
| 11 | -208071632992240 |
| 12 | 145764940849752116 |
| 13 | 3120575161041166080 |
| 14 | -117033448887725170108 |
| 15 | -6213292829713135654768 |
| 16 | 22498469957633292556668 |
| 17 | 8337558519301198902048768 |