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 | 1 |
| 2 | 10 |
| 3 | 16650 |
| 4 | 24928779600 |
| 5 | 111827645954579880000 |
| 6 | 3822731887490658669088662984000000 |
| 7 | 2132112202139633769017736141415928803125840000000000 |