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 | 1 |
| 2 | 3 |
| 3 | 48 |
| 4 | 3400 |
| 5 | 955860 |
| 6 | 1034141596 |
| 7 | 4340689156440 |
| 8 | 71756043154026904 |
| 9 | 4716284688998245793376 |
| 10 | 1237457313794197125403483936 |
| 11 | 1297922676419612772784598299454784 |
| 12 | 5444329780242560941321703550018388707904 |
| 13 | 91342929096228825123968637168641318872709897472 |