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 | 10 |
| 2 | 200 |
| 3 | 6000 |
| 4 | 240000 |
| 5 | 12000000 |
| 6 | 720000000 |
| 7 | 50400000000 |
| 8 | 4032000000000 |
| 9 | 362880000000000 |
| 10 | 36288000000000000 |
| 11 | 3991680000000000000 |
| 12 | 479001600000000000000 |
| 13 | 62270208000000000000000 |