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 | 0 |
| 2 | 2 |
| 3 | 31 |
| 4 | 1344 |
| 5 | 111920 |
| 6 | 16214000 |
| 7 | 3758757240 |
| 8 | 1310799454720 |
| 9 | 655551508577280 |
| 10 | 452647176631372800 |
| 11 | 418399785559398720000 |
| 12 | 504669505260741099417600 |
| 13 | 777461035821119354357452800 |
| 14 | 1501959201213688265322501427200 |