n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 150 |
4 | 735 |
5 | 3600 |
6 | 17640 |
7 | 86400 |
8 | 423210 |
9 | 2073000 |
10 | 10154040 |
11 | 49737000 |
12 | 243624060 |
13 | 1193330400 |
14 | 5845225440 |
15 | 28631349600 |
16 | 140243381160 |
17 | 686946520800 |
18 | 3364832751840 |
19 | 16481777119200 |
20 | 80731791755760 |
21 | 395444141299200 |
[1,6,30,150,735,3600,17640,86400,423210,2073000, 10154040,49737000,243624060,1193330400,5845225440, 28631349600,140243381160,686946520800, 3364832751840,16481777119200,80731791755760, 395444141299200] |