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 | 36 |
| 3 | 1632 |
| 4 | 81600 |
| 5 | 4308480 |
| 6 | 235530240 |
| 7 | 13189693440 |
| 8 | 751812526080 |
| 9 | 43438057062400 |
| 10 | 2536782532444160 |
| 11 | 149439552820346880 |
| 12 | 8866746800673914880 |
| 13 | 529276578255612149760 |
| 14 | 31756594695336728985600 |
| 15 | 1913864106972293533532160 |
| 16 | 115788778471823758778695680 |
| 17 | 7029059963701301121153761280 |