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A234843
as a simple table
n
a(n)
1
1
2
2
3
5
4
16
5
51
6
201
7
877
8
4443
9
25284
10
161698
11
1145508
12
8910291
13
75373563
14
687950735
15
6727985390
[1,2,5,16,51,201,877,4443,25284,161698,1145508, 8910291,75373563,687950735,6727985390]