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A046696
as a simple table
n
a(n)
0
1
1
2
2
5
3
13
4
21
5
31
6
47
7
73
8
99
9
125
10
151
11
177
12
315
13
409
[1,2,5,13,21,31,47,73,99,125,151,177,315,409]