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A119642
as a simple table
n
a(n)
1
4
2
5
3
7
4
8
5
9
6
13
7
15
8
52
9
82
10
134
11
216
12
341
13
538
14
1414
15
17306
16
17582
[4,5,7,8,9,13,15,52,82,134,216,341,538,1414,17306, 17582]