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 | 19 |
| 2 | -31 |
| 3 | -15485 |
| 4 | -257759 |
| 5 | 19383059 |
| 6 | 873485761 |
| 7 | -28992725309 |
| 8 | -2947706709055 |
| 9 | 34914759096979 |
| 10 | 11062889692388641 |
| 11 | 73329048495226499 |
| 12 | -46309928432170516511 |
| 13 | -1224828484332785265005 |
| 14 | 212723654088018032104961 |
| 15 | 10763608149690668144341699 |
| 16 | -1046306531193423334034678399 |