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A126797
as a simple table
n
a(n)
1
0
2
1
3
2
4
5
5
22
6
107
7
616
8
3516
9
22163
10
144739
11
979292
12
6803735
[0,1,2,5,22,107,616,3516,22163,144739,979292, 6803735]
