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 | -728 |
| 4 | 1 |
| 5 | 15626 |
| 6 | -728 |
| 7 | -117648 |
| 8 | 1 |
| 9 | 530713 |
| 10 | 15626 |
| 11 | -1771560 |
| 12 | -728 |
| 13 | 4826810 |
| 14 | -117648 |
| 15 | -11375728 |
| 16 | 1 |
| 17 | 24137570 |
| 18 | 530713 |
| 19 | -47045880 |
| 20 | 15626 |
| 21 | 85647744 |
| 22 | -1771560 |
| 23 | -148035888 |
| 24 | -728 |
| 25 | 244156251 |
| 26 | 4826810 |
| 27 | -386889776 |
| 28 | -117648 |
| 29 | 594823322 |
| 30 | -11375728 |