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 | 5 |
| 3 | 50 |
| 4 | 1050 |
| 5 | 27300 |
| 6 | 1365000 |
| 7 | 68250000 |
| 8 | 5801250000 |
| 9 | 527913750000 |
| 10 | 68628787500000 |
| 11 | 8372712075000000 |
| 12 | 1758269535750000000 |
| 13 | 298905821077500000000 |
| 14 | 74726455269375000000000 |
| 15 | 19428878370037500000000000 |
| 16 | 6625247524182787500000000000 |