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 | 168 |
| 2 | 16632 |
| 3 | 1270080 |
| 4 | 82927152 |
| 5 | 4878631296 |
| 6 | 266658822144 |
| 7 | 13809041326080 |
| 8 | 686528482768128 |
| 9 | 33073815190800384 |
| 10 | 1554470788616718336 |
| 11 | 71638807647968870400 |
| 12 | 3249771974096785403904 |
| 13 | 145542549641019667218432 |