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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 14 |
| 5 | 105 |
| 6 | 1287 |
| 7 | 26026 |
| 8 | 873392 |
| 9 | 48825972 |
| 10 | 4559177300 |
| 11 | 712438499850 |
| 12 | 186574469114250 |
| 13 | 81973527087903750 |
| 14 | 60475684628083567500 |
| 15 | 74966560165861256115000 |
| 16 | 156232609877290216839177600 |