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A147916
as a simple table
n
a(n)
1
1
2
2
3
6
4
16
5
54
6
232
7
936
8
3880
9
23002
10
127008
11
720116
12
4318818
13
26024362
14
158973744
15
1022131470
16
6808137758
[1,2,6,16,54,232,936,3880,23002,127008,720116, 4318818,26024362,158973744,1022131470,6808137758]