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 | 2 |
| 3 | -9 |
| 4 | 32 |
| 5 | -625 |
| 6 | 324 |
| 7 | -117649 |
| 8 | 131072 |
| 9 | -4782969 |
| 10 | 1562500 |
| 11 | -25937424601 |
| 12 | 35831808 |
| 13 | -23298085122481 |
| 14 | 110730297608 |
| 15 | -4805419921875 |
| 16 | 562949953421312 |
| 17 | -48661191875666868481 |
| 18 | 91507169819844 |
| 19 | -104127350297911241532841 |
| 20 | 640000000000000000 |
| 21 | -865405750887126927009 |