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 | -55 |
| 2 | 3135 |
| 3 | -206921 |
| 4 | 15853838 |
| 5 | -1397545578 |
| 6 | 140468598738 |
| 7 | -15968808432126 |
| 8 | 2038653078262911 |
| 9 | -290421593787032345 |
| 10 | 45904341056626435097 |
| 11 | -8009163497468146614783 |
| 12 | 1535354075146666869569332 |
| 13 | -322017256862378971357996708 |
| 14 | 73606894659465268081682059380 |