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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 5 |
| 5 | 5 |
| 6 | -8 |
| 7 | 560 |
| 8 | -5997 |
| 9 | -14765 |
| 10 | 176826 |
| 11 | 5206410 |
| 12 | -42491623 |
| 13 | -427057527 |
| 14 | -412183484 |
| 15 | 147180377804 |
| 16 | -569782989113 |
| 17 | -8367671807033 |
| 18 | -119681999820906 |
| 19 | 4440973420854454 |
| 20 | -121033449284728099 |
| 21 | 49772248126885197 |
| 22 | 36615485147317407728 |
| 23 | 1696495197400394891912 |