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A340708
as a simple table
n
a(n)
1
1
2
2
3
3
4
5
5
8
6
13
7
24
8
40
9
69
10
130
11
231
12
408
13
689
14
1272
15
2153
16
3960
17
6993
18
12560
[1,2,3,5,8,13,24,40,69,130,231,408,689,1272,2153, 3960,6993,12560]