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 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 76 |
| 5 | 8220 |
| 6 | 3418216 |
| 7 | 5156362008 |
| 8 | 28205998918336 |
| 9 | 571801003320734400 |
| 10 | 44006976469834509225856 |
| 11 | 13095012982298536065778624128 |
| 12 | 15245644966564725709168192019570176 |
| 13 | 69953982671396722666217758540260522923520 |
| 14 | 1270721533437616701720124856867026526491583190016 |