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A126149
as a simple table
n
a(n)
1
0
2
1
3
1
4
3
5
13
6
64
7
470
8
4921
9
83997
10
2411453
11
123544541
12
11537642646
13
2013389528672
[0,1,1,3,13,64,470,4921,83997,2411453,123544541, 11537642646,2013389528672]