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 | -391 |
| 3 | -1175 |
| 4 | 458641 |
| 5 | 2301041 |
| 6 | -896635319 |
| 7 | -6308683751 |
| 8 | 2454058631585 |
| 9 | 22238090874721 |
| 10 | -8635680761357159 |
| 11 | -95808996990263479 |
| 12 | 37141246445981806129 |
| 13 | 487826768288181211345 |
| 14 | -188783965120435102822039 |
| 15 | -2865977269485973590683399 |
| 16 | 1107183737638672431002905921 |