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A266934
as a simple table
n
a(n)
1
2
2
6
3
21
4
115
5
816
6
7185
7
68890
8
671796
9
6347005
10
56180274
11
460040399
12
3470013146
13
24151911854
14
155703390684
[2,6,21,115,816,7185,68890,671796,6347005, 56180274,460040399,3470013146,24151911854, 155703390684]