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A131935
as a simple table
n
a(n)
1
4
2
7
3
15
4
31
5
65
6
136
7
285
8
597
9
1251
10
2621
11
5492
12
11507
13
24111
14
50519
15
105853
[4,7,15,31,65,136,285,597,1251,2621,5492,11507, 24111,50519,105853]