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 | 7 |
| 2 | 42 |
| 3 | 210 |
| 4 | 1260 |
| 5 | 6720 |
| 6 | 40110 |
| 7 | 228480 |
| 8 | 1338120 |
| 9 | 7761600 |
| 10 | 45291120 |
| 11 | 263674950 |
| 12 | 1537291560 |