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 | 1 |
| 2 | 6 |
| 3 | 60 |
| 4 | 1820 |
| 5 | 136136 |
| 6 | 27261234 |
| 7 | 14169550626 |
| 8 | 19344810307020 |
| 9 | 69056421075989160 |
| 10 | 645693859487298425256 |
| 11 | 15803204856220738696714416 |
| 12 | 1012673098498882654470985390406 |
| 13 | 169885799961166470686816475170920550 |
| 14 | 74614732877610423587753604318734054624100 |