n | a(n) |
---|---|
1 | 1 |
2 | 6 |
3 | 40 |
4 | 280 |
5 | 2016 |
6 | 14784 |
7 | 109824 |
8 | 823680 |
9 | 6223360 |
10 | 47297536 |
11 | 361181184 |
12 | 2769055744 |
13 | 21300428800 |
14 | 164317593600 |
15 | 1270722723840 |
16 | 9848101109760 |
17 | 76467608616960 |
18 | 594748067020800 |
19 | 4632774416793600 |
20 | 36135640450990080 |
21 | 282202144474398720 |
22 | 2206307674981662720 |
23 | 17266755717247795200 |
[1,6,40,280,2016,14784,109824,823680,6223360, 47297536,361181184,2769055744,21300428800, 164317593600,1270722723840,9848101109760, 76467608616960,594748067020800,4632774416793600, 36135640450990080,282202144474398720, 2206307674981662720,17266755717247795200] |