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A361931
as a simple table
n
a(n)
1
1
2
2
3
7
4
10
5
26
6
177
7
508
8
13812
9
73873
10
4638434
11
4638435
12
1874400183
13
114936835817
[1,2,7,10,26,177,508,13812,73873,4638434,4638435, 1874400183,114936835817]