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 | 4 |
| 2 | 24 |
| 3 | 208 |
| 4 | 2400 |
| 5 | 34624 |
| 6 | 599424 |
| 7 | 12107008 |
| 8 | 279467520 |
| 9 | 7257355264 |
| 10 | 209403009024 |
| 11 | 6646303019008 |
| 12 | 230126121738240 |
| 13 | 8632047179874304 |
| 14 | 348695526455476224 |
| 15 | 15091839203924574208 |
| 16 | 696733490476660162560 |