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 | 1 |
| 2 | 1 |
| 3 | -1 |
| 4 | 2 |
| 5 | -9 |
| 6 | 8 |
| 7 | -625 |
| 8 | 2 |
| 9 | -117649 |
| 10 | 128 |
| 11 | -6561 |
| 12 | 8 |
| 13 | -25937424601 |
| 14 | 18 |
| 15 | -23298085122481 |
| 16 | 16 |
| 17 | -9 |
| 18 | 32768 |
| 19 | -48661191875666868481 |
| 20 | 400 |
| 21 | -104127350297911241532841 |
| 22 | 648 |
| 23 | -81 |
| 24 | 256 |
| 25 | -907846434775996175406740561329 |
| 26 | 490 |
| 27 | -59604644775390625 |
| 28 | 1024 |
| 29 | -2541865828329 |
| 30 | 1296 |