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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 320 |
| 5 | 4500 |
| 6 | 74088 |
| 7 | 1404928 |
| 8 | 30233088 |
| 9 | 729000000 |
| 10 | 19487171000 |
| 11 | 572305637376 |
| 12 | 18324574916544 |
| 13 | 635492476982272 |
| 14 | 23734930078125000 |
| 15 | 949978046398464000 |
| 16 | 40569151622782717952 |
| 17 | 1841458074930764070912 |