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 | 9 |
| 2 | 216 |
| 3 | 5184 |
| 4 | 124416 |
| 5 | 2985984 |
| 6 | 71663616 |
| 7 | 1719926784 |
| 8 | 41278242816 |
| 9 | 990677827584 |
| 10 | 23776267862016 |
| 11 | 570630428688384 |
| 12 | 13695130288521216 |
| 13 | 328683126924509184 |
| 14 | 7888395046188220416 |
| 15 | 189321481108517289984 |