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A147949
as a simple table
n
a(n)
1
1
2
2
3
6
4
16
5
54
6
232
7
936
8
5070
9
25700
10
139976
11
795314
12
4513652
13
26295578
14
160997802
15
1236858656
16
9227571868
[1,2,6,16,54,232,936,5070,25700,139976,795314, 4513652,26295578,160997802,1236858656,9227571868]