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A052438
as a simple table
n
a(n)
1
0
2
2
3
0
4
2
5
4
6
19
7
84
8
821
9
12485
10
343572
11
16164685
12
1289300669
[0,2,0,2,4,19,84,821,12485,343572,16164685, 1289300669]