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 | 10 |
| 2 | 180 |
| 3 | 3240 |
| 4 | 58320 |
| 5 | 1049760 |
| 6 | 18895680 |
| 7 | 340122240 |
| 8 | 6122200320 |
| 9 | 110199605760 |
| 10 | 1983592903680 |
| 11 | 35704672266240 |
| 12 | 642684100792320 |
| 13 | 11568313814261760 |
| 14 | 208229648656711680 |
| 15 | 3748133675820810240 |