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) |
|---|---|
| 3 | 136 |
| 4 | 2178 |
| 5 | 58618 |
| 6 | 63804 |
| 7 | 2755907 |
| 8 | 0 |
| 9 | 144839908 |
| 10 | 304162700 |
| 11 | 4370652168 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 0 |
| 17 | 21914086555935085 |
| 18 | 187864919457180831 |
| 19 | 0 |
| 20 | 13397885590701080090 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |
| 24 | 19095442247273220984552 |
| 25 | 1553298727699254868304830 |
| 26 | 1539325689516673750004702 |
| 27 | 242402817739393059296681797 |