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 | -3 |
| 3 | -24 |
| 4 | -216 |
| 5 | -2801 |
| 6 | -42166 |
| 7 | -762397 |
| 8 | -15685040 |
| 9 | -366477168 |
| 10 | -9523974486 |
| 11 | -273453483050 |
| 12 | -8583651341879 |
| 13 | -292700900034984 |
| 14 | -10770969729108326 |
| 15 | -425541512224476567 |
| 16 | -17964544188354355022 |
| 17 | -807097409926675847400 |