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 | -2 |
| 2 | 19 |
| 3 | -287 |
| 4 | 6046 |
| 5 | -163529 |
| 6 | 5402503 |
| 7 | -210861146 |
| 8 | 9494154073 |
| 9 | -484412718869 |
| 10 | 27621019129606 |
| 11 | -1740608617884047 |
| 12 | 120129615653128849 |
| 13 | -9011461782602547722 |
| 14 | 730048534006459494331 |
| 15 | -63523233920344578554519 |
| 16 | 5908390803126052265064598 |