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 | 8 |
| 2 | 19 |
| 3 | -1 |
| 4 | -10 |
| 5 | 48 |
| 6 | -234 |
| 7 | 1302 |
| 8 | -8328 |
| 9 | 60672 |
| 10 | -497688 |
| 11 | 4547448 |
| 12 | -45846864 |
| 13 | 505862064 |
| 14 | -6065584128 |
| 15 | 78555965184 |
| 16 | -1093053332736 |
| 17 | 16264215348480 |
| 18 | -257730606190080 |
| 19 | 4333624828853760 |
| 20 | -77067187081620480 |
| 21 | 1445257352902763520 |
| 22 | -28505367984508416000 |