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A088970
as a simple table
n
a(n)
0
3
1
6
2
12
3
25
4
50
5
100
6
201
7
402
8
804
9
1608
10
3216
11
6433
12
12867
13
25735
14
51471
15
102943
16
205887
[3,6,12,25,50,100,201,402,804,1608,3216,6433, 12867,25735,51471,102943,205887]