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 | -1 |
| 2 | -11 |
| 3 | -181 |
| 4 | -3863 |
| 5 | -66121 |
| 6 | 4478365 |
| 7 | 1211701763 |
| 8 | 226423491793 |
| 9 | 43068302925551 |
| 10 | 8876725117679941 |
| 11 | 1997577117130009403 |
| 12 | 483811389670392875449 |
| 13 | 121594250947356501211559 |
| 14 | 28960468994349845642813677 |