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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 5 |
| 10 | -5 |
| 11 | 0 |
| 12 | 0 |
| 13 | 45 |
| 14 | -95 |
| 15 | 50 |
| 16 | 10 |
| 17 | 485 |
| 18 | -1640 |
| 19 | 1790 |
| 20 | -325 |
| 21 | 5425 |
| 22 | -27510 |
| 23 | 47160 |
| 24 | -27775 |
| 25 | 66567 |