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 | -14 |
| 4 | 184 |
| 5 | -3194 |
| 6 | 65472 |
| 7 | -1503924 |
| 8 | 37593664 |
| 9 | -1004163802 |
| 10 | 28314667072 |
| 11 | -835650200380 |
| 12 | 25652840146624 |
| 13 | -815280469973380 |
| 14 | 26728163562423360 |
| 15 | -901336722528156712 |
| 16 | 31194183364269262848 |
| 17 | -1105930698812430437626 |