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A006946
as a simple table
n
a(n)
1
1
2
2
3
3
4
7
5
13
6
28
7
55
8
114
9
227
10
466
11
931
12
1891
13
3781
[1,2,3,7,13,28,55,114,227,466,931,1891,3781]