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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 10 |
| 6 | 200 |
| 7 | 5915 |
| 8 | 229376 |
| 9 | 10946964 |
| 10 | 618435840 |
| 11 | 40283203125 |
| 12 | 2968444272640 |
| 13 | 243926836708126 |
| 14 | 22100985366992896 |
| 15 | 2187905889450121295 |
| 16 | 234881024000000000000 |
| 17 | 27172548942138551952680 |
| 18 | 3369317755618569294053376 |
| 19 | 445726953911853022186520169 |