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A229719
as a simple table
n
a(n)
1
4
2
6
3
28
4
76
5
256
6
374
7
948
8
1024
9
2264
10
2166
11
4396
12
3912
[4,6,28,76,256,374,948,1024,2264,2166,4396,3912]
