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 | 7 |
| 2 | -1 |
| 3 | -707 |
| 4 | -4799 |
| 5 | 107807 |
| 6 | 1954399 |
| 7 | -18661307 |
| 8 | -814668799 |
| 9 | 1761841207 |
| 10 | 378933847999 |
| 11 | 1771616332493 |
| 12 | -196012302071999 |
| 13 | -2435055913999793 |
| 14 | 110362604948800799 |
| 15 | 2477077374441460693 |
| 16 | -65432412090510374399 |
| 17 | -2439688784186741175193 |