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 | 5 |
| 2 | 13600 |
| 3 | 294372000000 |
| 4 | 252880261890048000000000 |
| 5 | 27099784799070466617992871936000000000000 |
| 6 | 882065676199020188908312950703217787436793856000000000000000000 |