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 | 0 |
| 1 | 1 |
| 2 | -12 |
| 3 | -729 |
| 4 | -8048 |
| 5 | -30210 |
| 6 | 8748 |
| 7 | 235088 |
| 8 | 194880 |
| 9 | 531441 |
| 10 | 362520 |
| 11 | -11182908 |
| 12 | 5866992 |
| 13 | 8049614 |
| 14 | -2821056 |
| 15 | 22023090 |
| 16 | 63590656 |
| 17 | -117494622 |
| 18 | -6377292 |
| 19 | -214061380 |
| 20 | 243130080 |
| 21 | -171379152 |
| 22 | 134194896 |
| 23 | 830555544 |
| 24 | -142067520 |
| 25 | -308059025 |
| 26 | -96595368 |
| 27 | -387420489 |
| 28 | -1891988224 |