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A243272
as a simple table
n
a(n)
1
1
2
0
3
1
4
1
5
2
6
5
7
21
8
120
9
1312
10
26525
11
1073690
12
84471633
[1,0,1,1,2,5,21,120,1312,26525,1073690,84471633]