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 | -12 |
| 4 | 152 |
| 5 | -2210 |
| 6 | 36976 |
| 7 | -704837 |
| 8 | 15132932 |
| 9 | -362099010 |
| 10 | 9566898126 |
| 11 | -276863733707 |
| 12 | 8715530417502 |
| 13 | -296641340905299 |
| 14 | 10858928017129838 |
| 15 | -425542158316462627 |
| 16 | 17779220784851800828 |
| 17 | -789053832262002586555 |
| 18 | 37076561046965367191298 |