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 | 44 |
| 2 | 878 |
| 3 | -54472 |
| 4 | -5183540 |
| 5 | 2449744 |
| 6 | 27528715336 |
| 7 | 1195712499872 |
| 8 | -151266315784048 |
| 9 | -16776228493414720 |
| 10 | 702203805185457376 |
| 11 | 208389464888487862144 |
| 12 | 996888570345112992448 |
| 13 | -2601849549129056926112512 |
| 14 | -128192585558205188847080320 |
| 15 | 32898121757138562880306993664 |