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 | 34 |
| 3 | 650 |
| 4 | 10500 |
| 5 | 161700 |
| 6 | 2493120 |
| 7 | 39372480 |
| 8 | 644112000 |
| 9 | 10977120000 |
| 10 | 195392736000 |
| 11 | 3636061228800 |
| 12 | 70737918451200 |
| 13 | 1437896940480000 |
| 14 | 30512401920000000 |
| 15 | 675213301002240000 |
| 16 | 15564170478624768000 |
| 17 | 373267990604500992000 |
| 18 | 9302809053765427200000 |