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 | -1 |
| 2 | -1 |
| 3 | -7 |
| 4 | -95 |
| 5 | -2105 |
| 6 | -68945 |
| 7 | -3126895 |
| 8 | -187481215 |
| 9 | -14354383825 |
| 10 | -1366150472225 |
| 11 | -158177224078775 |
| 12 | -21890843392951775 |
| 13 | -3568350888585380425 |
| 14 | -676628627780999760625 |
| 15 | -147662618352313843681375 |
| 16 | -36745377178714846268837375 |
| 17 | -10342398978039119692295758625 |