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A007646
as a simple table
n
a(n)
1
1
2
3
3
7
4
33
5
67
6
223
7
663
8
912
9
1383
10
3777
11
3972
12
10669
13
48375
[1,3,7,33,67,223,663,912,1383,3777,3972,10669, 48375]