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A027696
as a simple table
n
a(n)
1
3
2
4
3
6
4
8
5
10
6
11
7
14
8
17
9
30
10
41
11
43
12
50
13
60
14
88
15
145
16
276
17
322
18
374
19
823
20
1152
[3,4,6,8,10,11,14,17,30,41,43,50,60,88,145,276, 322,374,823,1152]