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 | 15 |
| 2 | 195 |
| 3 | 2145 |
| 4 | 19665 |
| 5 | 158535 |
| 6 | 1447875 |
| 7 | 18243225 |
| 8 | 232985025 |
| 9 | 2435846175 |
| 10 | 28443399075 |
| 11 | 508347464625 |
| 12 | 8431258460625 |
| 13 | 109007191668375 |
| 14 | 1781609910955875 |
| 15 | 40590985621811625 |
| 16 | 792811219265690625 |