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A136379
as a simple table
n
a(n)
0
2
1
4
2
9
3
17
4
25
5
42
6
76
7
143
8
273
9
533
10
1052
11
2072
12
4122
13
8221
14
16417
15
32799
[2,4,9,17,25,42,76,143,273,533,1052,2072,4122, 8221,16417,32799]