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 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 14 |
| 5 | 1008 |
| 6 | 30240 |
| 7 | 40824000 |
| 8 | 543367440000 |
| 9 | 8538631200000 |
| 10 | 619059300631200000 |
| 11 | 697138154923310100000 |
| 12 | 233961081764887982682777600000 |
| 13 | 1658996761605569331750604800000 |
| 14 | 38748634361900747691921626112000000 |