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 | -30 |
| 2 | 3345 |
| 3 | -512030 |
| 4 | 88617345 |
| 5 | -16360095774 |
| 6 | 3146109187345 |
| 7 | -622294742016030 |
| 8 | 125653141164729345 |
| 9 | -25774484801870336030 |
| 10 | 5353054537005702294801 |
| 11 | -1122995842254699148800030 |
| 12 | 237552033786848383463977345 |
| 13 | -50601782105721473281984512030 |