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) |
|---|---|
| 2 | -1 |
| 3 | 51 |
| 4 | -10 |
| 5 | -10594 |
| 6 | 2961 |
| 7 | -210 |
| 8 | 356487 |
| 9 | -115940 |
| 10 | 12642 |
| 11 | -420 |
| 12 | -101141295 |
| 13 | 35804857 |
| 14 | -4751890 |
| 15 | 254562 |
| 16 | -4620 |
| 17 | 48350824787 |
| 18 | -18071509911 |
| 19 | 2689347661 |
| 20 | -180909586 |
| 21 | 5471466 |
| 22 | -60060 |