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 | 10 |
| 2 | 670 |
| 3 | 44900 |
| 4 | 3008980 |
| 5 | 201647240 |
| 6 | 13513419640 |
| 7 | 905603817680 |
| 8 | 60689173906000 |
| 9 | 4067093973641120 |
| 10 | 272556904729800160 |
| 11 | 18265441319366096960 |
| 12 | 1224061254004727782720 |
| 13 | 82030646145243326825600 |