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 | -4097 |
| 3 | 531442 |
| 4 | -16773121 |
| 5 | 244140626 |
| 6 | -2177317874 |
| 7 | 13841287202 |
| 8 | -68702695425 |
| 9 | 282430067923 |
| 10 | -1000244144722 |
| 11 | 3138428376722 |
| 12 | -8913940970482 |
| 13 | 23298085122482 |
| 14 | -56707753666594 |
| 15 | 129746582562692 |
| 16 | -281406240452609 |
| 17 | 582622237229762 |