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 | 992 |
| 2 | 385520 |
| 3 | 73424000 |
| 4 | 7032770680 |
| 5 | 330234251072 |
| 6 | 9708251628992 |
| 7 | 205208814844160 |
| 8 | 3384709979113500 |
| 9 | 45920987396301280 |
| 10 | 531402725344000864 |
| 11 | 5384625599438260096 |
| 12 | 48726640432968418240 |
| 13 | 399835655086212744000 |