n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 21 |
3 | 1091 |
4 | 114520 |
5 | 21298264 |
6 | 6410456640 |
7 | 2923097201856 |
8 | 1920450126458880 |
9 | 1747596822651334656 |
10 | 2133806329230225408000 |
11 | 3405545462439659704320000 |
12 | 6950705677729940374290432000 |
13 | 17807686090745585163974737920000 |
[0,1,21,1091,114520,21298264,6410456640, 2923097201856,1920450126458880, 1747596822651334656,2133806329230225408000, 3405545462439659704320000, 6950705677729940374290432000, 17807686090745585163974737920000] |