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 | 3 |
| 2 | 6 |
| 3 | 6 |
| 4 | 72 |
| 5 | 1440 |
| 6 | 26640 |
| 7 | 589680 |
| 8 | 13426560 |
| 9 | 353808000 |
| 10 | 9841305600 |
| 11 | 306920275200 |
| 12 | 10257340262400 |
| 13 | 375041008742400 |
| 14 | 14697998361446400 |
| 15 | 621176708984832000 |
| 16 | 28005677334835200000 |
| 17 | 1347486252598886400000 |