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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 108 |
| 6 | 10476 |
| 7 | 108625644 |
| 8 | 11798392680793836 |
| 9 | 139202068568601568785946949658348 |
| 10 | 19377215893777651167043206536157529523359277782016064519251404524 |